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: Brown's IRB required a mental status exam to ensure patients could understand the research dimensions of the project before they could be enrolled in the study. Choices:  1. Brown accepted everyone into the project. 2. The patients needed to be mentally examined. 3. The patients need to be sane to participate in the study.

1