This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
100 women, followed up 20 months, with OCPs, 5 became pregnant, Calculate the Pearl Index - 
Select and explain. 
A. 100, B. 200, C. 300, D. 400
C: 300
Answer: C: 300 
Explanation: HWY =Total accidental pregnancies/months of exposure*1200 HWY=5/20*1200= 300 HWY indicates contraceptive efficacy Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 510