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
All are features of rosacea keratitis except: 
Select and explain. 
A. Corneal vascularisation, B. Associated blepharoconjunctivitis, C. Central superficial ulcer, D. Progresses to involve the whole cornea
C: Central superficial ulcer
Answer: C: Central superficial ulcer 
Explanation: Ans. Central superficial ulcer