Introducing a woman, Shashank said, “She is the mother of the only daughter of my son.” How that woman is related to Shashank?

The correct answer is D. Daughter-in-law.

Shashank’s son has a daughter. The woman is the mother of Shashank’s son’s daughter. This means that the woman is Shashank’s daughter-in-law.

A daughter is a female child of a parent. A sister-in-law is the sister of one’s spouse. A wife is a woman who is married to a man.

In this case, the woman is not Shashank’s daughter, sister-in-law, or wife. She is his daughter-in-law.