How many pairs of chromosomes does a human usually have?
B
Correct answer
Explanation
Humans typically have 23 pairs of chromosomes, totaling 46 chromosomes per cell. These pairs include 22 pairs of autosomes and one pair of sex chromosomes (XX or XY). The question specifically asks for pairs, not total chromosomes. 18 and 36 are not standard human chromosome numbers. 46 is the total count, not the number of pairs.