Definition: 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.
Input: Statement: For example, the engineers of the battalion exposed to sarin showed no higher illness rates than others. Choices:  1. Sarin clearly caused illness in the engineers who were exposed to it.  2. The engineers tried to use illness as an excuse to leave the battalion.  3. It appears that sarin did not cause the engineers to become ill. 

1