Which one of the following statements is false? A: Tetracycline can depress bone growth and produce permanent discoloration of teeth in children under 8 years old B: Fluoroquinolones are active against both gram-negative and gram-positive organisms C: Legionella, Chlamydia, Mycoplasma are sensitive to macrolides D: Macrolides may be used in patients who are allergic to penicillins E: Penicillin G can be kept in solution at room temperature