A 6 week child is very sick-looking. Bloods: Na+ 124, K+ 2.8. Dehydrated. What would you choose to resuscitate?

The key is B. 0.9% NS. [Rsuscitation is mostly done with 0.9% NS or ringers lactate, or hartmans solution. Here is hypokalemia. To treat hypokalaemia the cut off value is below 2.5 mmol/L and absence of anuria during resuscitation. Maintenance is with fluid E].