This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
[{'content': 'To define still bih, period is specified from - \nSelect and explain. \nA. 20th week of gestation to 1 week after bih, B. 28th week of gestation to 1 week after bih, C. 20th week of gestation to bih, D. 28th week of gestation to bih', 'role': 'user'}, {'content': "Answer: D \nExplanation: Death of a foetus weighing 1000g at bih (this is equivalent to 28weeks of gestation.) REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 519", 'role': 'assistant'}]