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
In which of the following condition gastric wash is contraindicated? 
Select and explain. 
A. Oxalic acid, B. Sulphuric acid, C. Opiate, D. Dhatura
B: Sulphuric acid
Answer: B: Sulphuric acid 
Explanation: The only absolute contraindication is corrosive poisoning (except carbolic acid), owing to the danger of perforation. In the following conditions stomach wash can be done by taking proper precautions: Convulsant poisons Comatose patients Volatile poisons Upper alimentary disease (e.g., esophageal varices) Marked hypothermia and hemorrhagic diathesis Ref: The Essentials of Forensic Medicine and Toxicology by KS Narayan Reddy, 27th edition, Page 453.