I understand that a later ruling can't contradict an earlier one, but does that mean that Chazal are infallible, the way Catholics believe the Pope is infallible? And if so, where's the line? Who was the last infallible member of Chazal before the curtain came down?
This question is not a dupe of this one, for the following reasons:
It is more historically specific (chazal as opposed to "gedolei yisroel")
It is more doctrinally specific