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 17 year old girl with keratitis and severe pain in the eye came to the hospital and acanthamoeba keratitis was suspected. The patient gave the history of following 4 points. Out of these which is not a risk factor for acanthamoeba keratitis. 
Select and explain. 
A. Extended wear contact lens., B. Exposure to diy water., C. Corneal trauma, D. Squamous blepharitis
D: Squamous blepharitis
Answer: D: Squamous blepharitis 
Explanation: D i.e. Squamous blepharitis