Absence of fructose in semen indicates –
**Core Concept**
The presence of fructose in semen is crucial for sperm survival and function, as it serves as an energy source. **Fructose** is produced by the **seminal vesicles**. Its absence can indicate a specific condition affecting the seminal vesicles.
**Why the Correct Answer is Right**
The correct answer is related to the condition where there's an issue with the seminal vesicles, which are responsible for producing fructose. This condition affects the **ejaculatory ducts**, leading to an absence of fructose in the semen.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it doesn't directly relate to the absence of fructose in semen.
**Option B:** Similarly, this option is incorrect as it doesn't specify the condition related to fructose absence.
**Option C:** This choice is also incorrect as it doesn't accurately describe the condition affecting fructose production.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the absence of fructose in semen can indicate **congenital absence of the seminal vesicles** or other conditions affecting these structures, which can impact fertility.
**Correct Answer:** D. Congenital absence of seminal vesicles.