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
Tropomyosin 
Select and explain. 
A. Helps in the fusion of actin and myosin, B. Prevents attachment of actin and myosin, C. Slides over myosin, D. Causes Ca2+ release
B: Prevents attachment of actin and myosin
Answer: B: Prevents attachment of actin and myosin 
Explanation: The active site of actin in skeletal muscles is where myosin binds. This is covered by Tropomyosin.