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: Physiology
Thin filament consists of all except: 
Select and explain. 
A. Actin, B. Troponin, C. Myosin, D. Tropomyosin
C: Myosin
Answer: C: Myosin 
Explanation: Myosin is thick filament. All others  in the options are thin filaments.