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
All of the following are examples of calcium binding proteins, EXCEPT: 
Select and explain. 
A. Calmodulin, B. Troponin, C. Calbindin, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Many different Ca2+-binding proteins have been described, including troponin, calmodulin, and calbindin. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 2.