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': 'Which antibody is least commonly seen in keloid \nSelect and explain. \nA. IgG, B. IgM, C. IgE, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is\'c\'i.e. IgE(Ref: Aesth. plast" Sarg. 6:149_152, 19g2]', 'role': 'assistant'}]