You will be given a definition of a task first, then some input of the task.
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: A key reason that screening is not performed is the widely held perception that treatment is not effective. Choices: 1. A key reason that screening doesn't happen is the perception that treatment is the only route. 2. A key reason that screening doesn't happen is the perception that treatment doesn't work. 3. A key reason that screening doesn't happen is the perception that treatment doesn't work for people who drink recreationally.
Output:
1