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
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. 
Select and explain. 
A. Ectopia lentis, B. Lenticonus, C. Coloboma, D. Microspherophakia
A: Ectopia lentis
Answer: A: Ectopia lentis 
Explanation: A i.e. Ectopia lentis