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': 'Calcium in human milk in mg/dl- \nSelect and explain. \nA. 28, B. 45, C. 35, D. 55', 'role': 'user'}, {'content': "Answer: A \nExplanation: Calcium content in breast milk is 28mg/100g.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-582 table 21", 'role': 'assistant'}]