This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'Which of the following vitamins is used to increase the HDL levels? \nSelect and explain. \nA. Folic acid, B. Nicotinic acid, C. Thiamine, D. Pyridoxine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nicotinic acid raises the HDL levels. The exact mechanism of action is still not known. The use of niacin for hyperlipidemia is limited by dilatation of blood vessels and flushing, along with skin irritation.', 'role': 'assistant'}]