Microbiology MDR TB is defined as- A Resistance to INH and Ethambutol B Resistance to Rifampicin and Ethambutol C Resistance to Pyrazinamide and Rifampicin D Resistance to INH and Rifampicin 💡 Explanation MDR TB is defined as- ✓ Correct Answer: D. Resistance to INH and Rifampicin