This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hospital waste and disaster management, Occupational health, Subject name: Social & Preventive Medicine
Minimum duration of developing coal miners pneumoconiosis is - 
Select and explain. 
A. 2-4 years, B. 4-6 years, C. 8-10 years, D. More than 10 years
D: More than 10 years
Answer: D: More than 10 years 
Explanation: - The coal miners pneumoconiosis has two phases; first phase is simple pneumoconiosis which is associated with little ventilatory impairment. - this phase may require about 12 years of work exposure for its development. - second phase is characterized by progressive massive fibrosis Reference: Park's textbook of preventive and social medicine, 23rd edition, pg no:806 <\p>