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: Gynaecology & Obstetrics
[{'content': 'The most sensitive method for detecting cervical chlamydia trachomatis infection is \nSelect and explain. \nA. Direct fluorescent antibody test, B. Enzyme immunoassay, C. PCR, D. Culture on irradiated McConkey cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PCR', 'role': 'assistant'}]