This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
Least pregnancy failure rate in 
Select and explain. 
A. IUCD, B. Oestrogen + Progesterone, C. Oestrogen alone, D. Progesterone alone
B: Oestrogen + Progesterone
Answer: B: Oestrogen + Progesterone 
Explanation: (Oestrogen + Progesterone) (547-Dutta 6th)Pregnancy Failure Rate (H,W,Y) (PEARL - INDEX)**Number of accidental pregnancies x 1200Number of patients in 100 year1200 = Number of months in 100 years* Condome = 14 * IUCD = 2* Diaphragm = 20 LNG- IUS (0.2 H.W.Y)]* Rhythm method = 20-30 = 1-2 H.W.Y* Coitus interruptus = 20 * OCP = * Progesterone alone [0.5-2 H.W.Y