which is the largest zone of indian railway???

Answer: Northern Railway
Question: when was the theory of seafloor spreading proposed?

Answer: 1960s
Answer this question: when did the eagles win a super bowl??

2017
Q: when does the forty days of lent end?A: before Easter Sunday
Input: when does season 4 of last man on earth?

Output: October 1, 2017
Please answer this: who created the first seamless bifocal a precursor to all progressive lenses?
Irving Rips