This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Best and most successful treatment of bronchial asthma is 
Select and explain. 
A. Avoidance of antigen, B. Bronchodilators, C. Corticosteroids, D. Anticholinergics
A: Avoidance of antigen
Answer: A: Avoidance of antigen 
Explanation: (A) Avoidance of antigen # Elimination of the causative agent(s) from the environment of an allergic individual with asthma is the most successful means available for treating this condition (for details on avoidance, Desensitization or immunotherapy with extracts of the suspected allergens has enjoyed widespread favor, but controlled studies are limited and have not proved to be highly effectiv.