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: Pharmacology
[{'content': 'Which of the following is a leukotriene antagonist? \nSelect and explain. \nA. Montelukast, B. Zileuton, C. Omahzumab, D. Nedocromil', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Out of all the given options, Montelukast is a leukotriene antagonist. Ref: K D Tripathi Textbook of Pharmacology, 5th Edition, Page 205; Modern Pharmacology With Clinical Applications By Charles R. Craig, Robe E. Stitzel, Pages 465-67', 'role': 'assistant'}]