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: Medicine
Which one of the following is the most common cause for 'Restrictive cardiomyopathy' : 
Select and explain. 
A. Alcohol, B. Hemochromatosis, C. Amyloidosis, D. Sarcoidosis
C: Amyloidosis
Answer: C: Amyloidosis 
Explanation: Answer is C (Amyloidosis) Although all options mentioned in the question other than alcohol have been listed as causes for restrictive cardiomyopathy, amyloidosis appears to be the contmonest cause amongst them. 'The most frequent causes of restrictive cardiomyopathy are amyloidosis, radiation and myocardial fibrosis fter open hea surgery' 'Myocardial involvement with amyloid is a common cause of secondary restrictive cardiomyopathy'