This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Most unstable leprosy is ? 
Select and explain. 
A. BB, B. BL, C. BT, D. TT
A: BB
Answer: A: BB 
Explanation: Ans. is'a'i.e., BBStable forms of leprosy -> polar forms of leprosy, i.e., Tuberculoid leprosy (TT) and lepromatous leprosy (LL).Unstable forms of leprosy -+ Borderline forms of leprosy, i.e., Borderline tuberculoid (BT), borderline (BB) and Borderline lepromatous (BL). BB is the most unstable form.