This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
What is the approximate Total fetal cardiac output? 
Select and explain. 
A. 300 ml/kg/min, B. 450 ml/kg/min, C. 600 ml/kg/min, D. 150 ml/kg/min
B: 450 ml/kg/min
Answer: B: 450 ml/kg/min 
Explanation: b. 450ml/kg/min(Ref: Nelson's 20/e p 2161)Total fetal cardiac output, i.e. combined output of both left and right ventricles--is 450mL/kg/min.65% of descending aortic blood flow returns to the placenta and remaining 35% perfuses the fetal organs and tissues.