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': 'During extraction of tooth to known cardiac patient experienced angina this was most likely to be precipitated by \nSelect and explain. \nA. Allergy to LA, B. Stimulus of pain and anticipation, C. Adrenaline in drug, D. Upright position of chair', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]