This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiomyopathy, Subject name: Pathology
Which protein is defective in dialated cardiomyopathy? 
Select and explain. 
A. Myosin, B. Troponin, C. Tropomysoin, D. Dystrophin
D: Dystrophin
Answer: D: Dystrophin 
Explanation: Ans. is 'd' i.e., Dystrophin o Dialated cardiomyopathy occus due to defective cytoskeleton proteins. Most important protein inovolved is dystrophin. Other proteins affected are1) Desmin2) MLP Protein3) ab crystalline proteins