Pointing to a photograph, a woman says, "This man`s son`s sister is my mother-in-law." How is the woman`s husband related to the man in the photograph ?

A. Grandson
B. Son
C. Son-in-law
D. Nephew
E. None of these
Answer: A . Grandson

Justification: Man's son's sister -- Man's daughter.
So, the man's daughter is the mother of the woman's husband.
Thus, the woman's husband is the grandson of the man in the photograph.