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
Exacerbation of lesions in patients of borderline leprosy is seen in - 
Select and explain. 
A. ENL (erythema nodosum leprosum), B. Lepra reaction type I, C. Jarisch-Herheimer reaction, D. Resolving leprosy
B: Lepra reaction type I
Answer: B: Lepra reaction type I 
Explanation: Type 1 or reversal reaction occurs in paucibacillary or multibacillary cases in unstable types like BT,BB,BL ENL is seen only in MB cases like BL and LL type only Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 342