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
The toxicity of methyl alcohol is due to ? 
Select and explain. 
A. Formic acid, B. Ethanol, C. Methanol itself, D. All of the above
A: Formic acid
Answer: A: Formic acid 
Explanation: Ans. is 'a' i.e., Formic acid