This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Biochemistry
Protein of muscle which helps in relaxation is 
Select and explain. 
A. Nebulin, B. Titin, C. Desmin, D. Calcineurin
B: Titin
Answer: B: Titin 
Explanation: Titin Location: Reaches from the Z line to the M line.Function: Largest protein in the body. Role in relaxation of the muscle.Ref: Harper&;s Biochemistry; 30th edition; Chapter 51 Muscle & the Cytoskeleton