This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and Errors of Refraction, Subject name: Ophthalmology
[{'content': '18 month old child presents with both eyes adducted. What is the first thing for diagnosis? \nSelect and explain. \nA. Examination under anaesthesia, B. Refractive error examination, C. Forced duction testing, D. Fundus examination', 'role': 'user'}, {'content': "Answer: A \nExplanation: Given the age of the child in question, any test has to be performed under anesthesia(EUA), since the child will not cooperate for any examination. During EUA: Refractive error examination is done to rule out hypermetropia as a cause of B/L adduction. Force duction test is used for diagnosis of Restrictive strabismus (eg Duane's retraction syndrome).", 'role': 'assistant'}]