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': 'Defective DNA repair is a/w \nSelect and explain. \nA. Albinism, B. Xeroderma pigmentosa, C. Vitiligo, D. Icthyosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Xeroderma pigmentosa', 'role': 'assistant'}]