Triple

Target entity: William Marshal, 1st Earl of Pembroke
Context triple: [Gilbert Marshal, 4th Earl of Pembroke, father, William Marshal, 1st Earl of Pembroke]

• A. William Marshal, 1st Earl of Pembroke chosen
  William Marshal, 1st Earl of Pembroke, was a renowned Anglo-Norman knight and statesman who served multiple English kings and became one of medieval England’s most powerful and respected magnates.
• B. William Marshal, 2nd Earl of Pembroke
  William Marshal, 2nd Earl of Pembroke, was a 13th-century English nobleman and magnate who inherited his famous father's titles and estates and played a role in the politics of the early reign of Henry III.
• C. Sir William Marshall
  Sir William Marshall was a British Army general best known for leading successful campaigns in the Mesopotamian theatre during World War I.
• D. William Longespée, 3rd Earl of Salisbury
  William Longespée, 3rd Earl of Salisbury, was an illegitimate son of King Henry II of England who became a prominent Anglo-Norman nobleman and military leader in the early 13th century.
• E. William Marshall
  William Marshall was an American big band leader, vocalist, and actor active in the mid-20th century.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.