As part of a health center educational program on tuberculosis (TB), skin tests are offered as a screening measure. Which statement by a participant to the nurse requires further exploration by the nurse? 1. "My grandfather had tuberculosis and died from it." 2. "When I have these skin tests, nothing ever shows up." 3. "I had a shot for tuberculosis 5 years ago." 4. "I won’t take medicine even if they do find something."