A 32-year-old otherwise well man presents with a 3-day history of fever, productive cough, pleuritic chest pain and dyspnoea. He is a non-smoker with no significant comorbidities. On examination, temperature is 38.5 °C, respiratory rate 22 breaths/min, oxygen saturation 96% on room air and there is bronchial breathing over the right lower zone. Chest X-ray confirms a right lower lobe consolidation. CURB-65 score is 0 and he is suitable for outpatient management. Which oral antibiotic regimen is the most appropriate first-line choice?