The isotonic concentration for sodium chloride is 0.9 %, and for glucose is 5 %. Which of the following solutions is isotonic with the above solutions? A solution containing:

D: Choices A & B are both hypertonic. 4 % glucose contains 4/5 of

the concentration of dissolved particles that are in (isotonic) 5 % glucose.

0.18 % sodium chloride contains 1/5 of the concentration of dissolved particles

that are in 0.9 % sodium chloride (0.18/0.9 = 0.2). One fifth plus four fifths add

to five fifths of the number of particles that are required for an isotonic

solution.