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
Which of the following inhalation anaesthetics should be avoided in middle ear surgery when tympanic grafts are used: 
Select and explain. 
A. Halothane, B. Nitrous oxide, C. Ether, D. Isoflurane
B: Nitrous oxide
Answer: B: Nitrous oxide 
Explanation: Nitrous oxide