This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
All are major calcium binding proteins except 
Select and explain. 
A. Troponin, B. Calmodulin, C. Actinin, D. Calcineurium
C: Actinin
Answer: C: Actinin 
Explanation: Troponin helps in contraction of muscle .calmodulin helps in activalting enzymes and calcinuerium helps in inactivation of calcium channels