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: Ophthalmology
[{'content': 'Typical iris coloboma is located at \nSelect and explain. \nA. Supero - temporal quadrant, B. Supero - nasal quadrant, C. Infero - temporal quadrant, D. Infero - nasal quadrant', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Iris coloboma :\n\nIt is congenital malformation due to failure to closure of choroidal or fetal tissue.\nMost common site is infero - nasal quadrant.', 'role': 'assistant'}]