Definition: In this task, you're given a statement and three sentences as choices. Your job is to determine the neutral choice based on your inference from the statement and your commonsense knowledge. The neutral choice is a sentence that neither agrees nor disagrees with the statement. Indicate your answer as '1', '2', or '3', corresponding to the choice number of the selected sentence. If sentence X agrees with sentence Y, one's correctness follows from the other one. If sentence X disagrees with sentence Y, they can not be correct at the same time.
Input: Statement: Following the approach of the Section 812 Prospective Report, we estimated the percentage change in the prevalence rate for chronic bronchitis using the estimated coefficient from Schwartz's study in a C-R function, and then applied this percentage change to a baseline incidence rate obtained from another source. Choices: 1. We had no formula for guessing the change in prevalence rate. 2. Following the approach of the report, we guessed that the percentage change in the prevalence rate for chronic bronchitis using the coefficient from the study. 3. Following the approach of the report, we guessed that the percentage change in the prevalence rate for chronic bronchitis using the coefficient from the study, but found that the result was about 40% too low.

3