This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Thin filament is mainly composed of 
Select and explain. 
A. Actin, B. Myosin, C. Tropomyosin, D. Dystrophin
A: Actin
Answer: A: Actin 
Explanation: The thick filaments are made of myosin molecules. The thin molecules are made of actin.(Ref: Textbook of physiology N Geetha 2nd edition page no.38)