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': 'Gonioscopy is used to study \nSelect and explain. \nA. Ant. Chamber, B. Post chamber, C. Angle of anterior chamber, D. Retina', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Angle of anterior chamber Gonioscopy is examination of angle of anterior chamber Q.', 'role': 'assistant'}]