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: Forensic Medicine
[{'content': 'Antidote for oxalic acid poisoning - \nSelect and explain. \nA. BAL, B. Animal charcoal, C. Calcium gluconate, D. Magnesium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Antidote : Any calcium preparation (e.g. calcium gluconate/chloride, lime water, suspension of chalk), which converts poison into insoluble calcium oxalate is an antidote for\xa0oxalate poisoning.', 'role': 'assistant'}]