This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
[{'content': 'A patient presents to the emergency department with uniocular diplopia. Examination with oblique illumination shows golden crescent while examination with co-axial illumination show a dark crescent line. Which of the following is the most likely diagnosis? \nSelect and explain. \nA. Lenticonus, B. Coloboma, C. Microspherophakia, D. Ectopia lentis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) Ectopia lentisRef: 'Ophthalmology by Khurana (2005)/p. 25; 'Clinical Examination in Ophthalmology' by Mukherjee (2006)/166; Neema 6/e, p. 285, 286Presence of uniocular diplopia together with finding of golden crescent on oblique illumination (edge of subluxated lens) or black crescent line on co-axial illumination (edge of subluxated lens) suggests a diagnosis of 'Subluxation' of the crystalline lens.", 'role': 'assistant'}]