An Elderly Woman Comes into the Clinic Complaining of "Feeling

An elderly woman comes into the clinic complaining of "feeling bad" since yesterday.She tells the nurse her husband gave her his medication for a headache.Which of the following represents the best response to this information?

A) "The cost of medication is high,so sharing is okay,since he has no problems."
B) "You both have the same health problems,so sharing is all right."
C) "Monitoring the drug effect is easier,since he also takes the medication."
D) "When you take his medication,it makes evaluating the effects of your medication harder."