Pharmacology MDR tuberculosis is defined by – A Resistance to all first and second line anti-tubercular agents B Resistance to any three first line anti-tubercular agents C Resistance to all first line and any three classes of second line anti-tubercular agents D Resistance to isoniazid and rifampicin 💡 Explanation MDR tuberculosis is defined by - ✓ Correct Answer: D. Resistance to isoniazid and rifampicin