This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Defect Xeroderma pigmentosum includes 
Select and explain. 
A. Mismatch repair, B. Base excision repair, C. Nucleotide excision repair, D. All of the above
C: Nucleotide excision repair
Answer: C: Nucleotide excision repair 
Explanation: Question repeated