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: Anatomy
Which of the following is characterically not associated with the development of interstial lung disease 
Select and explain. 
A. Organic dusts, B. Inorganic dusts, C. Toxic gases, D. None
D: None
Answer: D: None 
Explanation: All the mentioned are associated with interstial lung disease Interstitial lung disease may be caused by long-term exposure to hazardous materials, such as asbestos or coal dust, or it can be caused by an auto-immune disease such as rheumatoid ahritis. Once lung scarring occurs, it's generally irreversible.