You are a doctor in the emergency room. A runner comes in after completing a marathon and is dehydrated. You know the runner needs fluid through an IV but you have to decide between three options: A. Water (0% salt) B. Saline (water with 0.9 % salt) C. Saline (water with 2% salt)

The correct option is B

Explanation:

Normal saline (or 0.9% of salt in water) is a common therapy used in hydrating the body; usually during sickness (and sometimes after an exhaustive exercise). This normal saline helps in maintaining electrolyte balance and prevent fluid shift between intravascular, intracellular, and interstitial spaces in the runner's body.

An increase in this solute concentration of the salt might lead to an imbalance in the body of the runner which could lead to some other problem for the runner.