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': 'A patient presents to the emergency depament with uniocular diplopia. Examination with oblique illumination shows shining golden crescent while examination with co-axial illumination show a black dark crescent line. Which of the following is the most likely diagnosis. \nSelect and explain. \nA. Ectopia lentis, B. Lenticonus, C. Coloboma, D. Microspherophakia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Ectopia lentis', 'role': 'assistant'}]