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
Hemoglobin has: 
Select and explain. 
A. Four polypeptide chains, 2α, 1β, 1γ chain, B. Four heme molecules and four polypeptide chains, C. Four heme molecules, 2α, and 2β chains, D. One heme and one globin molecule
C: Four heme molecules, 2α, and 2β chains
Answer: C: Four heme molecules, 2α, and 2β chains 
Explanation: None