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
40 year old man presents with resting heart rate of 180 beats/min. Pressure-volume diagram of left ventricle is shown below. What is the cardiac output? 
Select and explain. 
A. 5.6 L/min, B. 5.2 L/min, C. 4.8 L/min, D. 6 L/min
A: 5.6 L/min
Answer: A: 5.6 L/min 
Explanation: EDV = 130ml ; ESV = 50ml
Stroke volume = EDV -ESV = 130 - 50 = 70 ml
Cardiac output = Heart rate × Stroke Volume
                         = 80 × 70
                         = 5600 ml /min