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
Causes of anterior polar cataract – 
Select and explain. 
A. Diabetes, B. Perforating corneal injury, C. Irradiation, D. Chalcosis
B: Perforating corneal injury
Answer: B: Perforating corneal injury 
Explanation: None