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: 135 "Hydro-chloride of strychnine," he said, over his shoulder, continuing to hum.  Choices:  1. He was talking to someone over his shoulder. 2. He did not mention Hydro-chloride of strychnine. 3. He is a chemistry professor.

2