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 patient having glaucoma develops blepharoconjunctivitis after instilling some antiglaucoma drug. Which of the following drug can be responsible for it – 
Select and explain. 
A. Timolol, B. Latanosprost, C. Dipiverine, D. Pilocarpine
A: Timolol
Answer: A: Timolol 
Explanation: Ocular side effects of topical agents for POAG
β-blockers :

Allergic blepheroconjunctivitis, corneal hyposthesia, Blurred vision, Dryness of eye, superficial punctate keratitis.

Cholinomimetics (Pilocarpine) :

Blurred vision, miosis, accommodative spasm, browache.

Symathomimetics :

Non-selective (Dipivefrine) :- Follicular conjunctivitis, rebound congestion, macular edema in aphakic.
Brimonidine: - Conjunctival blanching, ocular allergy.
Apraclonidine: - Allergies, fluctuation in visual acuity.

Carbonic anhydrase inhibitors (Dorzolamide, Brinzolamide) Punctate keratitis, ocular allergies.
Prostaglandin analogues (Latanoprost) Punctate keratitis, iris pigmentation.