A 30-year-old woman living in an inner-city area presents with cough, night sweats and weight loss for 3 months. Chest X-ray shows apical infiltrates with cavitation. She has no known TB contacts. What is the most appropriate next diagnostic step?AStart empiric TB treatment without further testsBOrder sputum for acid-fast bacilli smear, culture and nucleic acid amplification testingCPerform bronchoscopy onlyDTreat as community-acquired pneumonia with macrolides and no further work-upERely on a single tuberculin skin test onlyCheck my answer