P and Q are brothers. P is the father of S. R is the only son of Q and is married to U. How is U related to S?
P and Q are brothers and P is the father of S.
=> S can be either son or daughter of P.
R is the son of Q and is the husband of U.
=> S and R are cousins.
Thus, U is the sister-in-law of S.
=> Ans - (A)
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