Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: histamine H2 receptor | Statement: [cimetidine, actsOn, histamine H2 receptor]

Target entity: histamine H2 receptor
Context triple: [cimetidine, actsOn, histamine H2 receptor]

• A. H2 receptor antagonist cimetidine
  H2 receptor antagonist cimetidine is a pioneering anti-ulcer medication that reduces stomach acid production by blocking histamine H2 receptors in the gastric parietal cells.
• B. M2 muscarinic acetylcholine receptor
  The M2 muscarinic acetylcholine receptor is a G protein–coupled receptor subtype primarily found in the heart, where it mediates parasympathetic (vagal) effects such as slowing heart rate and reducing contractility.
• C. somatostatin receptor
  A somatostatin receptor is a G protein–coupled membrane receptor that binds the peptide hormone somatostatin to inhibit hormone secretion and modulate neurotransmission and cell proliferation.
• D. CB2 receptor
  The CB2 receptor is a cannabinoid receptor primarily expressed in immune and peripheral tissues, where it modulates inflammation and immune responses and serves as a key target of compounds like THC.
• E. H-2
  H-2 is an Interstate Highway in Hawaii that connects Honolulu with the central part of Oʻahu, including the city of Wahiawā and the vicinity of Schofield Barracks.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: histamine H2 receptor
Target entity description: The histamine H2 receptor is a G protein–coupled receptor primarily found in the stomach that mediates gastric acid secretion and is targeted by H2-blocker drugs used to treat ulcers and reflux.

• A. H2 receptor antagonist cimetidine
  H2 receptor antagonist cimetidine is a pioneering anti-ulcer medication that reduces stomach acid production by blocking histamine H2 receptors in the gastric parietal cells.
• B. M2 muscarinic acetylcholine receptor
  The M2 muscarinic acetylcholine receptor is a G protein–coupled receptor subtype primarily found in the heart, where it mediates parasympathetic (vagal) effects such as slowing heart rate and reducing contractility.
• C. somatostatin receptor
  A somatostatin receptor is a G protein–coupled membrane receptor that binds the peptide hormone somatostatin to inhibit hormone secretion and modulate neurotransmission and cell proliferation.
• D. CB2 receptor
  The CB2 receptor is a cannabinoid receptor primarily expressed in immune and peripheral tissues, where it modulates inflammation and immune responses and serves as a key target of compounds like THC.
• E. H-2
  H-2 is an Interstate Highway in Hawaii that connects Honolulu with the central part of Oʻahu, including the city of Wahiawā and the vicinity of Schofield Barracks.
• F. None of above. chosen