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
Which of the following is not a constituent of universal antidote? 
Select and explain. 
A. Activated charcoal, B. Tannic acid, C. Magnesium oxide, D. Potassium permanganate
D: Potassium permanganate
Answer: D: Potassium permanganate 
Explanation: Universal antidote is a mixture of activated charcoal,tonnic acid and magnesium oxide.