Mother's Milk

A medical student is taking a test and one of the questions he sees is:

- Name the three best advantages of mother's milk.

The student immediately writes:

- One: It has all the healthful nutrients needed to sustain a baby.

- Two: It is inside the mother's body and therefore protected from germs and infections.

But the student can't think of the third answer. Finally, he writes:

- Three: It comes in such nice containers.