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
All of the following can cause visual adverse effects except : 
Select and explain. 
A. Ethambutol, B. Rifampicin, C. Chloroquine, D. Digoxin
B: Rifampicin
Answer: B: Rifampicin 
Explanation: None