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: Medicine
Which of the following is the first strategy in the management of chronic obstructive lung disease ? 
Select and explain. 
A. Aminophylline, B. Anti-cholinergics, C. Cessation of smoking, D. Oral steroids
C: Cessation of smoking
Answer: C: Cessation of smoking 
Explanation: None