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
[{'content': 'Which of the following is impoant in calculaton of pearl index - \nSelect and explain. \nA. Number of aboions, B. Total accidental pregnancy, C. Socioeconomic status, D. Total gestational period', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Total accidental pregnancy", 'role': 'assistant'}]