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: Unknown
[{'content': 'Cause of the xeroderma pigmentosum is? \nSelect and explain. \nA. Missense mutation, B. DNA rapair defect, C. Trisomy, D. Production of guanine guanine dimmers in DNA', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. DNA repair defect * Xeroderma pigmentosum is an autosomal recessive disease with defect in DNA repair. It is characterized by extreme sensitivity to sunlight. The enzymes affected in this condition are:1. UV specific endonuclease (most common)2. DNA polymerase I3. DNA ligase", 'role': 'assistant'}]