Question
A 40-year-old male from Jilin was diagnosed with right lower lobe pneumonia and has undergone 7 days of intravenous drip treatment. The high fever has subsided, but he still has persistent yellow phlegm. Past treatment and its effectiveness show that penicillin is currently being used, but some doctors suggest that cephalosporin antibiotics might be better. When choosing antibiotics, should penicillin or cephalosporin antibiotics be used?