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
Contractile element in myofibril is: 
Select and explain. 
A. H band, B. Sarcoplasm, C. Sarcomere, D. A line
C: Sarcomere
Answer: C: Sarcomere 
Explanation: None