21. A first-year medical student is learning how to take a patient's history. Which of the following questions is an example of a "leading question" that should generally be avoided? (A) "Can you describe the pain in your chest?" (B) "When did you first notice this rash?" (C) "The pain doesn't radiate to your left arm, does it?" (D) "What were you doing when the dizziness started?" (E) "On a scale of 1 to 10, how would you rate your pain?"