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 ctaract 
Select and explain. 
A. DM, B. Perforating (penetrating) corneal injury, C. Irradation, D. Chalcosis
B: Perforating (penetrating) corneal injury
Answer: B: Perforating (penetrating) corneal injury 
Explanation: B i.e. Perforating corneal injury