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
Corneal endothelial cell count is done by: 
Select and explain. 
A. Specular microscopy, B. Keratometry, C. Gonioscopy, D. Slit lamp
A: Specular microscopy
Answer: A: Specular microscopy 
Explanation: Ans. Specular microscopy