This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
All are primary causes of hypogonadism except: 
Select and explain. 
A. Klinefelter syndrome, B. Cryptorchidism, C. Diabetes mellitus, D. Mumps orchitis
C: Diabetes mellitus
Answer: C: Diabetes mellitus 
Explanation: Ans: c (Diabetes mellitus) Ref: Harrison, 16 ed, p. 2194,17th ed, p. 2317It is clearly mentioned in Harrison that Klinefelters syndrome, cryptorchidism and orchitis are causes of primary hypogonadism. So the answer of exclusion is diabetes.There lire 2 types of hypogonadism1. Primary hypogonadism: The basic delect is at testicular level2. Hypogonadotrophic hypogonadismCauses of primary hypogonadismCauses of hypogonadotrophic hypogonadismKlinefelter syndromeICSOLCryptorchidismHypoprolactinaemiaPost orchitisC/c illnessHIV infectionHemochromatosisChemotherapyExcessive exerciseRadiationSubstance abuseSurgical orchidectomyCongenital causes- Kallman syndromeInfections