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
Administration of all the following will provide uterine relaxation, except 
Select and explain. 
A. Sevoflurane, B. Nitrous oxide, C. Nitroglycerine, D. Terbutaine
B: Nitrous oxide
Answer: B: Nitrous oxide 
Explanation: Nitrous oxide does not change uterine contractility in doses provided during delivery.