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': 'Which of the following minerals does not act as prosthetic group in enzymes? \nSelect and explain. \nA. Copper, B. Cobalt, C. Selenium, D. Manganese', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]