Detailed Instructions: In this task, you're given a statement, and three sentences as choices. Your job is to determine which sentence clearly disagrees with the statement. Indicate your answer as '1', '2', or '3' corresponding to the choice number of the selected sentence.
Q: Statement: This about the Mex War which our pa's fought?"He flicked open the pages eagerly. Choices: 1. His father fought in the Mexican War. 2. His father fought in the Mexican War and died there. 3. His father fought in the Vietnam War.
A:
3