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
In which type of poisonings is gastric lavage contraindicated ? 
Select and explain. 
A. Organophosphorus poisoning, B. Sedative drug poisoning, C. Corrosive acid poisoning, D. Barium carbonate poisoning
C: Corrosive acid poisoning
Answer: C: Corrosive acid poisoning 
Explanation: None