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': 'Features considered under Reid colposcopic index are all except \nSelect and explain. \nA. Margin, B. Color, C. Vessels, D. Floor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Colposcopic signs:\n→ Margin\n→ Color\n→ Vessels\n→ Iodine staining.', 'role': 'assistant'}]