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
Site specific recombination is 
Select and explain. 
A. Palindromic, B. Ser-form Holliday intermediate, C. RE + ligase, D. Inversion in same orientation / Non precise
C: RE + ligase
Answer: C: RE + ligase 
Explanation: C i.e. RE + ligase