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': 'Xanthoproteic reaction involves- \nSelect and explain. \nA. Carbolic acid, B. H2SO4, C. HCL, D. Nitric acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Xanthoproteic reaction is method for determination of amount of protein soluble in solution, using concentrated nitric acid.', 'role': 'assistant'}]