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': 'Lymphogranuloma venerum is characterised by all except \nSelect and explain. \nA. Primary lesions heal without scarring, B. Commonly develop systemic infection, C. Metronidazole is effective treatment, D. Groove sign is seen characteristically', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Doxycycline or erythromycin is used for treatment of LGV.', 'role': 'assistant'}]