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
Quindine is used to treat 
Select and explain. 
A. Hypertension, B. Angina pectoris, C. Atrial fibrillation, D. Congestive heart failure
C: Atrial fibrillation
Answer: C: Atrial fibrillation 
Explanation: None