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: Microbiology
Most common diagnostic test in LGV is - 
Select and explain. 
A. Fluorescent Antibody, B. Complement fixation test, C. Cell culture, D. Frei's test
C: Cell culture
Answer: C: Cell culture 
Explanation: Ans. is 'c' i.e., Cell culture . "Cell culture is the preferred mode of isolation now. Many cell lines are susceptible but those commonly used are McCoy and HeLa cells".