Given the task definition and input, reply with output. 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.

Statement: Pollock asked how to differentiate that type of study from doing a clinical trial. Choices: 1. Pollock asked how to tell the type of study. 2. Pollock knew he couldn't tell the type of study. 3. Pollock asked how to tell the type of study and the research helped him see a way.
2