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
Gastric wash contraindicated in: 
Select and explain. 
A. Oxalic acid, B. Sulphuric acid, C. Opiate, D. Dhatura
B: Sulphuric acid
Answer: B: Sulphuric acid 
Explanation: Sulphuric acid