This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: HAEM synth and porphyrias, Subject name: Biochemistry
[{'content': 'Porphyrin of normal erythrocyte haemoglobin is \nSelect and explain. \nA. Coproporphyrin I, B. Uroporphyrin III, C. Protoporphyrin III, D. Uroporphyrin I', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Heme is iron containing protoporphyrin. Protoporphyrins are named according to the side chains, i.e. Methyl, vinyl, propionyl.', 'role': 'assistant'}]