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
[{'content': 'An example of chromoprotein is \nSelect and explain. \nA. Hemoglobin, B. Sturine, C. Nuclein, D. Gliadin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chromoproteins: These are proteins with coloured prosthetic groups. Hemoglobin (Heme, red); Flavoproteins (Riboflavin, yellow), Visual purple (Vitamin A, purple) are some examples of chromoproteins.\nReference: Vasudevan 7th\xa0 ed, pg 43', 'role': 'assistant'}]