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
[{'content': 'The pearl index indicates teh number of accidental pregnancies per - \nSelect and explain. \nA. 1000 population, B. 100 live bihs, C. 100 women in the age group of 15 to 44 years, D. 100 women years', 'role': 'user'}, {'content': "Answer: D \nExplanation: park's textbook of preventive and social medicine 23rd edition. *pearl index is defined as the no of failure per 100 women year of exposure.", 'role': 'assistant'}]