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
Which of the proteins connect Z lines to M lines? 
Select and explain. 
A. Nebulin, B. Actin, C. Myosin, D. Titin
D: Titin
Answer: D: Titin 
Explanation: It is the largest protein.
It binds Z lines to M lines
It prevents overstretching of sarcomere