Answer: The correct answer is B) 23 in males.
In human beings, 23rd pair of chromosome, which is also called sex chromosomes is different amongst males.
It is XY in males whereas it is same in females that is XX.
23rd is the only homologous pair that is different in males as the presence of Y chromosomes determines the male sex. Chromosome pair 1- 22 are same in both males and females and are called autosomes.