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
Unilateral chronic conjunctivitis may be associated with 
Select and explain. 
A. Habit of smoking, B. Use of uniocular microscope, C. Foreign body retained is the fornix, D. Unilateral aphakia
C: Foreign body retained is the fornix
Answer: C: Foreign body retained is the fornix 
Explanation: Ans. Foreign body retained is the fornix