During a Medication History, the Client States, "I Take the Calcium

During a medication history, the client states, "I take the calcium supplement called calcitriol." How should the nurse respond to this statement?

A) "Calcitriol is a vitamin D supplement."
B) "What other medications do you take?"
C) "You don't understand the medications you are taking."
D) "Do you also take a vitamin D supplement?"
E) "Do you take the prescription strength or over-the-counter?"