This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'Mast cell stabilizer used in Bronchial Asthma is \nSelect and explain. \nA. Raloxifene, B. Ketotifen, C. Azelastin, D. Baclofen', 'role': 'user'}, {'content': "Answer: B \nExplanation: Mast cells are impoant in initiating the acute bronchoconstrictor responses to allergens & several other indirectly acting stimuli like exercise and hyperventillation.Ketotifen is a mast cell stabilizer which reduces the stimulation of mast cells and mediator release is reduced(histamine,PGD2,leukotrienes). Dose:1-2 mg BD;children 0.5 mg BD Reference:Harrison' s medicine-18th edition,page no:2104;Textbook of pharmacology-K D Tripathi,7th edition,page no:229", 'role': 'assistant'}]