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: Particulate Air Pollution as a Predictor of Mortality in a Prospective Study of U.S. Choices:  1. This study is about Particulate Air Pollution as a Predictor of infertility. 2. This study is about Particulate Air Pollution as a Predictor of Mortality. 3. This study is about Particulate Air Pollution as a Predictor of Mortality and was revolutionary.

1