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: Ophthalmology
Vitamin used for treating toxic ambylopia: March 2012 
Select and explain. 
A. Hydroxycobalamine, B. Vitamin B1, C. Vitamin B6, D. Vitamin B3
A: Hydroxycobalamine
Answer: A: Hydroxycobalamine 
Explanation: Ans: A i.e. Hydroxycobalamine Improvement in toxic amblyopias/ tobacco induced optic neuropathy may be hastened by intramuscular injections of 1000 microgram hydroxycobalamine