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: Last March, surgeons operated in vivo on a 6-month-old fetus suffering from excessive water in his brain. Choices: 1. It is not possible to perform surgery on a fetus at any stage. 2. The operation on the 6 month old fetus last March was seen as a great success. 3. Surgeons operated on a 6 month old fetus.

2