This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Side effect of halothane countered by atropine is \nSelect and explain. \nA. Bradycardia, B. Hypotension, C. Hypehermia, D. Constipation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Halothane usually causes sinus or nodal bradycardia which is reversed by atropine. Ref katzung 12th ed.', 'role': 'assistant'}]