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: Pharmacology
Which of the following drug is not used in glaucoma: 
Select and explain. 
A. Pilicarpine., B. Physostigmine., C. Metoprolol., D. Timolol.
C: Metoprolol.
Answer: C: Metoprolol. 
Explanation: Metoprolol is a beta blocker with local anaesthetic activity which cannot be used in glaucoma.