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: Medicine
[{'content': 'Site specific recombination is \nSelect and explain. \nA. Palindromic, B. Ser-form Holliday intermediate, C. RE + ligase, D. Inversion in same orientation / Non precise', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. RE + ligase', 'role': 'assistant'}]