This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'Corneal endothelial cell count is done by \nSelect and explain. \nA. Slit lamp examination, B. Gonioscopy, C. Keratometry, D. Specular microscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The specular microscope is a special instrument that allows the doctor and photographer to see and record the corneal endothelial cells. Some instruments touch the front or the cornea. Others are non-contact. These instruments take advantage of a bright specular or mirror like image that is created when the angle of the light for photography is at the correct angle. Since the cornea is clear, only a small amount returns to do the photography. It&;s similar to looking at the inside surface of a drinking glass by changing the angle of light. Image : Specular microscopy Reference :- Parsons diseases of eye 23rd edition', 'role': 'assistant'}]