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
[{'content': "Most common diagnostic test in LGV is - \nSelect and explain. \nA. Fluorescent Antibody, B. Complement fixation test, C. Cell culture, D. Frei's test", 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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".', 'role': 'assistant'}]