This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Ophthalmology
[{'content': 'This test is used in:- \nSelect and explain. \nA. Squint, B. Heterophoria, C. Esotropia, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The above diagram shows cover uncover test used for squint diagnosis(both tropias and phorias). Interpretation of cover, cover-uncover and alternate cover tests.', 'role': 'assistant'}]