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': 'The thickness of the cornea is measured by using – \nSelect and explain. \nA. Schiotz tonometer, B. Keratometer, C. Pachymeter, D. Aesthesiometer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pachymetry is used to measure thickness of cornea.', 'role': 'assistant'}]