Leprosy is not yet eradicated because -: (A) No effective vaccine, (B) Highly Infectious but low pathogenicity, (C) Only humans are reservoir, (D) Long incubation period
Answer is D. <p> Long incubation period (single best answer) Reference:Park&;s textbook of preventive and social medicine,K.Park,22nd edition,page no:291. <\p>