In living persons: 1) Motile sperms are usually seen upto 6 hours 2) Complete sperms are seen upto 26 hours
**Core Concept**
The question tests the understanding of the post-coital test (PCT), also known as the fern test or sperm penetration assay, which is used to assess the quality and motility of sperm in a woman's cervical mucus after intercourse. The PCT is a valuable tool in the evaluation of infertility and in the diagnosis of various reproductive disorders.
**Why the Correct Answer is Right**
The correct answer reflects the normal duration for which motile sperms and complete sperms can be observed in a post-coital test. Motile sperms are typically seen for up to 6 hours after intercourse, while complete sperms can be observed for up to 24-26 hours. This is because motile sperms are more susceptible to environmental factors such as temperature, pH, and the presence of seminal plasma, which can affect their viability and motility. Complete sperms, on the other hand, are more resistant to these factors and can survive for a longer period.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is too short for the duration of motile sperms. While some studies suggest that motile sperms can be seen for up to 3 hours, this is not the typical duration observed in most cases.
**Option B:** This option is incorrect because it is too short for the duration of complete sperms. While some studies suggest that complete sperms can be seen for up to 12-18 hours, this is not the typical duration observed in most cases.
**Option D:** This option is incorrect because it is too long for the duration of motile sperms. While some studies suggest that motile sperms can be seen for up to 12 hours, this is not the typical duration observed in most cases.
**Clinical Pearl / High-Yield Fact**
A post-coital test can be used to assess the quality of sperm and the cervical mucus in a woman's reproductive system. It is an important tool in the evaluation of infertility and in the diagnosis of various reproductive disorders.
**Correct Answer: A. Motile sperms are usually seen upto 6 hours**