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
Defective DNA repair is a/w 
Select and explain. 
A. Albinism, B. Xeroderma pigmentosa, C. Vitiligo, D. Icthyosis
B: Xeroderma pigmentosa
Answer: B: Xeroderma pigmentosa 
Explanation: B i.e. Xeroderma pigmentosa