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
Vagal stimulation of heart causes ? 
Select and explain. 
A. Increased heart rate, B. Increased RR interval in ECG, C. Increased cardiac output, D. Increased force of contraction
B: Increased RR interval in ECG
Answer: B: Increased RR interval in ECG 
Explanation: None