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: Social & Preventive Medicine
The Pearl index indicates the number of accidental pregnancies per - 
Select and explain. 
A. 1000 population, B. 100 live births, C. 100 women in the age group of 15 to 44 years, D. 100 women years
D: 100 women years
Answer: D: 100 women years 
Explanation: None