Circle the letter of the sentence in which the bold-faced type is used incorrectly.

a. orthopedic shoes can help correct a child's club foot.

b. An orthopedist at a ski resort has a large practice during the winter.

c. Help! There's a green orthopede in my sleeping bag.

d. Modern orthopedics can improve most curvatures of the spine.

The answer is c. orthopede isn't even a word.