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: The prisoner had been arrested in consequence of the discovery, in his room, by Detective Inspector Japp ”a most brilliant officer ”of the identical phial of strychnine which had been sold at the village chemist's to the supposed Mr. Inglethorp on the day before the murder.  Choices:  1. The prisoner was arrested for confessing to the murder. 2. The clue that solved the case was that a phial of strychnine had been sold just the day before. 3. The strychnine was used to assassinate the Duke.
1