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单项选择题

A 3-year-old previously healthy boy has become increasingly lethargic for the past 3 weeks. On physical examination, his temperature 36.9℃，pulse 80/min, respirations 15/min, and blood pressure 140/90 mmHg. Periorbital edema is present. Urinalysis shows 4+ proteinuria, and no blood, ketones, or glucose. Which of the following is the best information to give the boy's parents about his disease?

A．A relative should be found to provide a transplant
B．A course of antibiotic therapy is indicated
C．Rapid onset of renal failure is likely
D．Corticosteroid therapy should alleviate this problem
E．Other family members are at risk for this disease

问答题

下图中应该用G41还是G42?为什么？