A) Son's son
B) Brother
C) Son
D) Data inadequate
Correct Answer: C
Solution :
From the information it is clear that S is the mother of R (who's sex is not known). N is the daughter of R and sister of M (whose sex is also not known) Hence, M may be male or female therefore, may be son or daughter of R, son or daughter of S. Hence, data is not adequate.
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