A 25-Year-Old Man Is Found to Have Small Testes on Physical

A 25-year-old man is found to have small testes on physical examination.  He has normal male pattern facial and pubic hair.  Further laboratory testing reveals a decreased sperm count and normal serum testosterone level.  Which of the following is the most likely cause of these findings?

A) Kallmann syndrome
B) 5-alpha reductase deficiency
C) Klinefelter syndrome
D) Androgen use
E) Hyperprolactinemia

Correct Answer:

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