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: Physiology
Isovolumetric relaxation preceeds: 
Select and explain. 
A. Ventricular ejection, B. Ventricular relaxation, C. Atrial contraction, D. Atrial relaxation
A: Ventricular ejection
Answer: A: Ventricular ejection 
Explanation: Ventricular ejection