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: Pathology
A defect in xeroderma pigmentosum 
Select and explain. 
A. Nucleotide excision repair, B. Mismatch repair, C. Base excision repair, D. Double strand break repair
A: Nucleotide excision repair
Answer: A: Nucleotide excision repair 
Explanation: Explanation:
Types of defects in DNA-repair systems and conditions associated