This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
A 20 years old nulliparous women is on oral contraceptives pills. She is currently diagnosed as having pulmonary tuberculosis. Which anti-tubercular drug decreases the effect of OCP 
Select and explain. 
A. INH, B. Pyrazinamide, C. Ethambutol, D. Rifampicin
D: Rifampicin
Answer: D: Rifampicin 
Explanation: Ans. is d i.e. Rifampicin Interacuons of OCP's with other Drugs