Question

Answer the questions based on the information given below. Six persons M, N, O, P, Q and R live in a family of three generations. M is married to Q. M is the nephew of O. O doesn't have any sibling. R is the grandfather of P. N is the sister of R. The gender of O and P is same. How is O related to R?

A Sister
B Son
C Brother-in-law
D Uncle
E None of the above
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