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: Biochemistry
Heme synthesis requires 
Select and explain. 
A. Ferrous iron, B. Glycine, C. Succinyl CoA, D. All of these
D: All of these
Answer: D: All of these 
Explanation: Heme is synthesized from succinyl CoA, glycine and Iron (ferrous ion).