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: This tendency for medical specialties to operate within their own discipline with little cross-dissemination of information suggests that ED staff must be involved in conducting intervention trials in order to popularize the concept within their own field. Choices: 1. If ED staff can popularize the concept, it will help patients. 2. There is reason to believe that ED staff should be involved in intervention trials. 3. Medical specialties never operate within their own disciple.
3