A 70-year-old male client asks why he is receiving a lower dose of zaleplon than his son. As part of the nurse's teaching plan, which explanation will the nurse give this client?
a) "Your son has a higher tolerance for the medication."
b) "Age-related changes affect how your body metabolizes the drug."
c) "Your son has a different type of insomnia."
d) "Your son has a higher risk of side effects from the medication."