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: Anaesthesia
Bone marrow depression is seen with – 
Select and explain. 
A. Halothene, B. N2O, C. Ether, D. Isoflurane
B: N2O
Answer: B: N2O 
Explanation: N2O can cause bone marrow depression and megaloblastic anemia (VitB12 deficiency).