Unknown A patient was sputum negative for TB, but chest Xray was suggestive for TB. Which is the next step according to RNTCP A Liquid culture B CB - NAAT C Line probe assay D None of the above 💡 Explanation A patient was sputum negative for TB, but chest Xray was suggestive for TB. Which is the next step according to RNTCP ✓ Correct Answer: B. CB - NAAT