Isaac,a Spry and Active 84-Year-Old,is Hospitalized for a Knee Replacement

Isaac,a spry and active 84-year-old,is hospitalized for a knee replacement.He finds it a bit insulting when nurses ask him his name before they give him his medications.Why are the nurses asking for this information?

A) To determine whether he is mentally competent
B) To ensure they are administering the right medicine to the right patient
C) To ensure he will not be given too many pain killers
D) To check his pre-surgery memory for comparison purposes