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': 'All of the following are employed to evaluate a case of heterophoria except: \nSelect and explain. \nA. Maddox-rod test, B. Alternate cover test, C. Measurement of fusional reserve, D. Measurement of near point of convergence', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Alternate cover test', 'role': 'assistant'}]