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
Which of the following is not useful in chronic open angle glaucoma: 
Select and explain. 
A. Prostagladin analogue, B. Pilocarpine, C. Homatropine, D. Timolol
C: Homatropine
Answer: C: Homatropine 
Explanation: Ans. C: Homatropine Medical therapy for primary open angle glaucoma includes: 1st line-Beta blockers (timolol), brimonidine, prostaglandin analogues; Adjunctive-Dipivefrine, dorzolamide, pilocarpine