An 11-year-old girl is diagnosed with idiopathic thrombocytopenic purpura (ITP). Which parental statement helps the nurse evaluate that teaching is successful?

A. "Our daughter should avoid drugs containing sulfonamides": ITP is an autoimmune destruction of platelets. Certain drugs, including sulfonamides, can trigger or worsen platelet destruction. B. "Our daughter will need genetic counseling": ITP is generally acquired or idiopathic (unknown cause), not a hereditary genetic disorder. C. "When her hemoglobin falls below 3.5, she'll need blood": ITP affects platelets, not hemoglobin. Also, a hemoglobin of 3.5 is far beyond the point where a transfusion would have already been given. D. "Our daughter can still be involved in gymnastics": Patients with low platelets (ITP) must avoid contact sports or activities with a high risk of injury/falls due to the risk of internal bleeding.