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
Anesthetic agent/s which have tocolytic effect are? 
Select and explain. 
A. Halothane, B. Enflurane, C. Isoflurane, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd' i.e., All the above Halothane, enflurane and isoflurane produce a dose dependent decrease in uterine tone (tocolysis). Studies of isoflurane demonstrate that halogenated compounds reduce both the frequency of uterinecontractions and the interval between them.