A Patient with an Upper Respiratory Infection Reports Feeling Like

A patient with an upper respiratory infection reports feeling like the heart is pounding.After checking that the patient is not having chest pain or difficulty breathing,what is the most important question the nurse must ask the patient?

A) "How long have you had upper respiratory infection symptoms?"
B) "Are you using any over-the-counter cold or cough drugs?"
C) "Is this the first time you have felt like this?"
D) "What exercise have you done today?"