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: Pharmacology
[{'content': 'In which type of poisonings is gastric lavage contraindicated ? \nSelect and explain. \nA. Organophosphorus poisoning, B. Sedative drug poisoning, C. Corrosive acid poisoning, D. Barium carbonate poisoning', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]