This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: Anaesthesia
Drug producing Haematological side effect is:- 
Select and explain. 
A. Nitrous oxide, B. Halothane, C. Ketamine, D. Sevoflurane
A: Nitrous oxide
Answer: A: Nitrous oxide 
Explanation: Nitrous oxide inhibits Vitamin B12 dependent enzyme leading to Megaloblastic anemia and Peripheral Neuropathy.