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: Biochemistry
[{'content': "A child develops blisters on exposure to sunlight' Irregular dark spots on the skin are also found' He is very likely to have a defect in which of the following mechanisms? \nSelect and explain. \nA. Nucleotide excision repair, B. Mismatch repair, C. Recombination repair, D. Thymine dimers", 'role': 'user'}, {'content': 'Answer: A \nExplanation: The child in question is presenting with features of xeroderma pigmentosa, due to defect in nucleotide excision repair', 'role': 'assistant'}]