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
[{'content': 'Most unstable leprosy is ? \nSelect and explain. \nA. BB, B. BL, C. BT, D. TT', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]