A 6-month-old girl presents with cyanosis and a pulmonic stenosis murmur. Further evaluation of the patient reveals she has TOF.Which of the following interventions would be least helpful in stabilizing her condition until an open surgical correction can be performed?
A. Antibiotics for endocarditis prophylaxis
B. Supplemental iron
C. Supplemental oxygen
D. Beta-blockers
E. Hydralazine
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