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: However, it is obvious that if screening is not performed, the provision cannot be applied. Choices:  1. The provision cannot be applied if screening is not performed. 2. Screening is not necessary to apply the provision. 3. Screening always takes place before a provision can be applied.

2