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': 'The release of histamine and leukotrienes from mast cells is prevented by: \nSelect and explain. \nA. Zileuton, B. Nedocromil sodium, C. Zafirlukast, D. Fexofenadine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]