1.  Pointing to Ketan, Namrata said, "He is the son of my father's only son." How is Ketan's mother related to the Namrata ?

A. Daugther
B. Aunt
C. Sister
D. Sister-in-law
E. None of these

Answer: Option D

Explanation:

Namrata's father's only son -> Namrata's brother.

So, Ketan is the son of Namrata,s brother.

Thus, Ketan's mother is the wife of Namrata's brother.

i.e. Namrata's sister-in-law.