This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vestibulobullous disorders, Subject name: Dental
[{'content': 'Toxic epidermal necrolysis {TEN} involves body surface area \nSelect and explain. \nA. <10%, B. 10-20%, C. 20-30%, D. >30', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Based on body surface area ( BSA) of skin involved, epidermal necrolysis is classified into SJS: less than 10% BSASJS_TEN overlap: 10-30% BSA TEN : more than 30% BSA. From illustrated synopsis of dermatology and sexually transmitted diseases neena khanna 5th edition page no 92', 'role': 'assistant'}]