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
In lepromatous leprosy the single drug dapsone is continue for - 
Select and explain. 
A. 9 days, B. 90 days, C. 1 years, D. 10 years
C: 1 years
Answer: C: 1 years 
Explanation: In lepromatous leprosy the single drug is continued to one year. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 21ST EDITION. PAGE NO - 297