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 10 year old boy presents with severe itching of the eye and a ropy discharge. His symptoms aggravate in summer season. Most likely diagnosis is? 
Select and explain. 
A. Blepharitis, B. Trachoma, C. Vernal keratoconjunctivitis, D. Acute conjunctivitis
C: Vernal keratoconjunctivitis
Answer: C: Vernal keratoconjunctivitis 
Explanation: Vernal keratoconjunctivitis or spring catarrh is a recurrent, bilateral interstitial allergic inflammation of the conjunctiva usually seen in young males. It has seasonal incidence as the name suggests. Ref: A.K KHURANA (2005), Chapter 4, "Disease of The Conjunctiva", In the book, "Opthalmology", 3rd Edition, Newdelhi, Page 101