Sperm count less than 20 million/mL –

Correct option is B

Sol. Oligospermia refers to a low sperm count, defined as fewer than 15–20 million sperm per milliliter of semen, according to WHO standards. This condition can result from hormonal imbalance, varicocele, infections, or lifestyle factors such as smoking and alcohol use. It may reduce fertility potential in males but can often be treated with medication, lifestyle changes, or assisted reproductive techniques.
Explanation of each option:
· (a) Aspermia – Refers to the complete absence of semen during ejaculation, not just low sperm count. It is a more severe fertility issue.
· (b) Oligospermia – Correct. Refers to sperm count below 20 million/mL, indicating reduced sperm production.
· (c) Azoospermia – Refers to no sperm in semen at all, which is a more critical form of male infertility than oligospermia.
· (d) Asthenospermia – Describes reduced sperm motility, not a low sperm count. Sperm are present but move sluggishly, affecting fertilization.