This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Identification of Living, Subject name: Forensic Medicine
[{'content': "Hasse's formula is used in pregnancy to? \nSelect and explain. \nA. Estimate fetal age, B. Identify fetal blood group, C. Identify fetal sex, D. Identify fetal congenital malformations", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Estimate fetal ageRef. Textbook of forensic medicine and toxicology by nageshkumar rao, p 321', 'role': 'assistant'}]