Which of the following best responds to this patient question: "Why do you use a lead apron when exposing my radiographs?"

a. "In case you are pregnant."
b. "To protect you from possible scatter radiation."
c. "To assist with holding you still in the chair."
d. "Because it's required by law."

b. Lead and other materials that simulate lead used in protective aprons and thyroid collars absorb potential scatter radiation and protect other parts of the body from unnecessary radiation.