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: Pharmacology
[{'content': 'Niacin must be used in diabetics cautiously because \nSelect and explain. \nA. It causes hypoglycemia, B. It impairs Insulin sensitivity, C. Increases metabolism of oral hypoglycemic agents, D. It increases skin thickness', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Niacin can result in Insulin resistance and lead to hyperglycemia. Hence, it must be used cautiously in Diabetics.', 'role': 'assistant'}]