This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiomyopathy & Pericarditis, Subject name: Medicine
The most common toxin causing Dilated cardiomyopathy is - 
Select and explain. 
A. Alcohol, B. Chemotherapeutic agents, C. Heavy metal, D. Occupational expsoure
A: Alcohol
Answer: A: Alcohol 
Explanation: Ans. is 'a' i.e., Alcohol o Chronic Alcohol consumption is the most common cause of Toxic Dilated Cardiomyopathy.'Alcohol is the most common toxin implicated in chronic dilated cardiomyopathy.' - Harrison 18th/e p. 1961