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': 'CRISPR - Cas9 mediated gene editing involves which DNA repair mechanism \nSelect and explain. \nA. Nucleotide excision repair, B. Mismatch repair, C. Base excision repair, D. Non Homologous End joining repair', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CRISPR - Cas9 involves both homologous and non homologous end joining repair mechanism.', 'role': 'assistant'}]