This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Cytochrome Oxidase is a 
Select and explain. 
A. Hemoprotein, B. Flavin mononucleotide, C. Flavin adenine dinucleotide, D. flavin adenine trinucleotide
A: Hemoprotein
Answer: A: Hemoprotein 
Explanation: Cytochrome oxidase is a hemoprotein widely distributed in many tissues, having the typical heme prosthetic group present in myoglobin, hemoglobin, and other cytochromes.Ref: Harper Biochemistry; 30th edition; Chapter 12; Biologic Oxidation