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: Initially, the two groups were kept apart and unaware of each other. Choices:  1. The two groups were in physical contact with each other. 2. The two groups consisted of three people in each group. 3. The two groups were not in contact with each other.

1