3歲20 kg男孩，診斷感染influenza A，須給與藥物治療時，下列處方何者最適當？
zanamivir 2 inhalations QD for 5 days
zanamivir 1 inhalation QD for 10 days
oseltamivir 45 mg BID PO for 5 days
oseltamivir 45 mg QD PO for 10 days
