This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
True about Ringer's Lactate - 
Select and explain. 
A. Isotonic, B. Colloidal solution, C. Potassium level is same as that of serum potassium, D. Helps in acidosis by acid neutralization
A: Isotonic
Answer: A: Isotonic 
Explanation: Ringer's lactate solution (RL), also known as sodium lactate solution and Hamann's solution, is a mixture of sodium chloride, sodium lactate, potassium chloride, and calcium chloride in water. It is an isotonic solution .it is used for replacing fluids and electrolytes in those who have low blood volume or low blood pressure.It may also be used to treat metabolic acidosis and to wash the eye following a chemical burn. It is given by injection into a vein or applied to the affected area Ref Davidson 23rd edition pg 370