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: Pathology
A 32 years chain smoker presented with persistent productive cough, fever, and recurrent pulmonary infections. After his death lung specimen was extracted, which of the components are destroyed? 
Select and explain. 
A. Cartilage, B. Muscle, C. Elastic tissue, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None