This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
Which of the following is not a side effect of topical beta blockers? 
Select and explain. 
A. Hypoglycemia, B. Asthma, C. Bradycardia, D. Heterochromia iridis
D: Heterochromia iridis
Answer: D: Heterochromia iridis 
Explanation: Heterochromia iridis is side effect of PG analogues and not beta blockers. Beta blockers can cause hypoglycemia by blocking adrenaline action on liver to produce glucose