B- Semen liquefaction before 60 minutes is considered normal.

Semen is a mixture of fluids and cells that is ejaculated from the male reproductive system during sexual intercourse. It contains spermatozoa, seminal fluid, and other secretions from the prostate gland, seminal vesicles, and bulbourethral glands.

After ejaculation, semen undergoes a process called liquefaction, which involves the breakdown of the gel-like consistency of semen into a more fluid state. This process is necessary for the spermatozoa to swim freely and reach the female reproductive tract.

According to the World Health Organization (WHO) guidelines for semen analysis, complete liquefaction of semen should occur within 60 minutes after ejaculation. However, partial liquefaction may occur within 20-30 minutes, which is also considered normal.

If semen fails to liquefy or takes longer than 60 minutes to do so, it may indicate a problem with the prostate gland or other parts of the male reproductive system. Similarly, if semen liquefies too quickly, it may indicate an abnormality in the seminal vesicles or other glands.

In conclusion, statement B is true. Semen liquefaction before 60 minutes is considered normal, according to WHO guidelines for semen analysis.