Instructions: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Input: Context : Being one of the key figures of the North Vietnam armed forces in Vietnam War, Le Trong Tan was Deputy Commander of the Viet Cong and second commander of the 1975 Spring Offensive that effectively ended the war.
Answer : Vietnam War
Output:
What was the war that Le Trong Tan fought in?