This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Leprosy is not yet eradicated because - 
Select and explain. 
A. No effective vaccine, B. Highly Infectious but low pathogenicity, C. Only humans are reservoir, D. Long incubation period
D: Long incubation period
Answer: D: Long incubation period 
Explanation: <p> Long incubation period (single best answer) Reference:Park&;s textbook of preventive and social medicine,K.Park,22nd edition,page no:291. <\p>