This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diabetes Mellitus, Subject name: Medicine
[{'content': 'Glucose intolerance is caused by the deficiency of? \nSelect and explain. \nA. Selenium, B. Magnesium, C. Chromium, D. Zinc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chromium acts as a cofactor for insulin at insulin receptors and dietary deficiency of chromium would thus lead to impaired glucose tolerance.', 'role': 'assistant'}]