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: It is hard to prove that worker illness is a result of pesticide exposure in the field because other things, both on and off the job, can trigger physical symptoms, said Dr. Suzanne Wuerthele, an EPA toxicologist in Denver. Choices:  1. Worker illness as a result of pesticide exposure is hard to prove by researchers. 2. It is hard to prove because scientists are lazy and come up with conflicting results. 3. It is easy to prove that worker illness is a result of pesticide exposure.

3