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: Pediatrics
In a child with exercise induced asthma, which is done ? 
Select and explain. 
A. Prophylaxis with steroids, B. Prophylaxis with mast cell stabilizers, C. Prophylaxis with theophyline, D. Breathing excercise
B: Prophylaxis with mast cell stabilizers
Answer: B: Prophylaxis with mast cell stabilizers 
Explanation: Exercise induced asthma occurs in genetially susceptible indivduals with hyperactive airways because of loss of water and heat from the respiratory tract following exercise.Water loss induces mucosal hyperosmolarity and stimulates mediator release from mast cells. Ref : Essential paediatrics,O.P.Ghai,7 th edition pg no:359,361