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
Which one of the following statements about leprosy is true? 
Select and explain. 
A. Group surves for case detection are carried out when prevalence of leprosy is less than 1 per 1000, B. For determining the bacteriological index, ++ in a smear indicates 2 bacilli in every field, C. Minimum duration of treatment for paucibacillary cases is for 9 months, D. Minimum duration of treatment for multibacillary case is for 12 months
D: Minimum duration of treatment for multibacillary case is for 12 months
Answer: D: Minimum duration of treatment for multibacillary case is for 12 months 
Explanation: <p> Duration of Treatment for Multibacillary leprosy-MB blister packs for 12 months,within 18 months. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:324. <\p>