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: Surgery
[{'content': 'Nicotinamide is preferred over Niacin because? \nSelect and explain. \nA. Flushing is seen with niacin, B. Abdominal pain is seen with niacin, C. Breathlessness is seen with niacin, D. Less bioavailability', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Flushing is seen with niacin REF: Nutrition Almanac by John D. Kirschmann, Nutrition Search, Inc page 31 Niacin causes sudden release of histamine which produces ceain s/e which are not seen with nicotinamide Intense flushing Tingling Numbness Throbbing headache due to cerebral vasodilation.', 'role': 'assistant'}]