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
Episcleritis periodica refers to: 
Select and explain. 
A. Fleeting type of episclerities, B. Complicated episcleis, C. Intermediate stage between episcleritis and scleritis, D. None of the above
A: Fleeting type of episclerities
Answer: A: Fleeting type of episclerities 
Explanation: Ans. Fleeting type of episclerities