This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
In methyl alcohol poisoning there is CNS depression,cardiac depression and optic nerve atrophy.These effects are produced due to: 
Select and explain. 
A. Formaldehyde and formic acid, B. Acetaldehyde, C. Pyridine, D. Acetic acid
A: Formaldehyde and formic acid
Answer: A: Formaldehyde and formic acid 
Explanation: Methanol is metabolised to formic acid & formaldehyde ,which produces these kinds of symptoms. Ref: kKD Tripathi 8th ed.