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
A 30 year old presents with nausea, weakness, headache and impaired vision and high anion gap metabolic acidosis. Most likely cause is: 
Select and explain. 
A. Methanol, B. Ethanol, C. Ethylene glycol, D. Amphetamine
A: Methanol
Answer: A: Methanol 
Explanation: Methanol