Which of the following represents an exact quantity?

A$)$ There are $2\mathrm{.}54cm$ in an inch.

B$)$ A man is $5$ feet $10$ inches tall.

C$)$ A man weighs $200lb.$

D$)$ It takes $15$ minutes to drive to the grocery store.

E$)$ There are $80$ grams of sugar in a serving of soda.