Semen analysis sample of male paner of an infeile couple shows low volume with azoospermia and absent fructose. Serum FSH levels are normal. The most probable diagnosis is ?

**Core Concept**
Azoospermia and low semen volume with absent fructose levels suggest an ejaculatory duct obstruction or a seminal vesicle problem. The normal serum FSH levels indicate that the testes are functioning normally.

**Why the Correct Answer is Right**
The absent fructose levels are a key clue, as seminal vesicles produce fructose, which is an essential energy source for sperm. The absence of fructose suggests a problem with the seminal vesicles or ejaculatory ducts. The normal FSH levels rule out a testicular problem, as FSH stimulates the testes to produce sperm. The low semen volume and azoospermia further support the idea of an ejaculatory duct obstruction or seminal vesicle problem.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
Azoospermia and absent fructose levels should prompt a thorough investigation of the seminal vesicles and ejaculatory ducts, including imaging studies and possibly a vasal or retrograde ejaculation study.

**Correct Answer:** D. Ejaculatory duct obstruction or seminal vesicle problem.

✓ Correct Answer: C. Block in the efferent duct system