In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are :
(i) large chromosome (ii) small chromosome (iii) Y chromosome (iv) X chromosome

Options

A. (i) and (ii)
B. (iii) and (iv)
C. (iii) only (iv)
D. (ii) and (iv)

Answer

C

Explanation

X and Y-chromosome are unpaired due to difference in size which prevents pairing.