Triple

Target entity: Siege of Khe Sanh
Context triple: [26th Marine Regiment, battle, Siege of Khe Sanh]

• A. Battle of Khe Sanh chosen
  The Battle of Khe Sanh was a major and protracted siege in early 1968 in which U.S. Marines and South Vietnamese forces defended a remote base against a large-scale North Vietnamese assault, becoming one of the most famous and controversial engagements of the Vietnam War.
• B. Battle of Con Thien
  The Battle of Con Thien was a protracted and intense 1967 Vietnam War engagement near the Demilitarized Zone, marked by heavy artillery duels, siege-like conditions, and significant U.S. Marine and North Vietnamese casualties.
• C. Battle of Ia Drang
  The Battle of Ia Drang was a pivotal 1965 engagement between U.S. and North Vietnamese forces that marked the first major large-scale helicopter air assault and set the tone for American ground combat in the Vietnam War.
• D. Khe Sanh
  Khe Sanh is a town in Quảng Trị Province, Vietnam, best known as the site of a major and prolonged siege during the Vietnam War.
• E. Tet Offensive
  The Tet Offensive was a major 1968 campaign of surprise attacks by North Vietnamese and Viet Cong forces across South Vietnam that dramatically shifted U.S. public opinion and marked a turning point in the Vietnam War.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.