This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Cardiomyopathy may be seen in all except- 
Select and explain. 
A. Duchenne muscular dystrophy, B. Friedreich's ataxia, C. Type II glycogen storage, D. Alkaptonuria
D: Alkaptonuria
Answer: D: Alkaptonuria 
Explanation: Etiological classification of cardiomyopathy:
A. Primary myocardial involvement

Idiopathic (D, R, H)
Familial (D, R, H)
Eosinophilic endomyocardial disease (R)
Endomyocardial fibrosis (R)

B) Secondary myocardial involvement