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: Unknown
[{'content': 'Compared to breast milk colostrum is rich with : \nSelect and explain. \nA. Protein, B. Fat, C. Lactose, D. Water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Colostrum\nColostrum is the first stage of breast milk that occurs during pregnancy and lasts for several days after the birth of the baby.\nIt is either yellowish or creamy in color. It is also much thicker than the milk that is produced later in breastfeeding.\nColostrums is high in protein, fat-soluble vitamins, minerals, and immunoglobulins. Immunoglobulins are antibodies that pass from the mother to the baby and provide passive immunity for the baby.\n. Passive immunity protects the baby from a wide variety of bacterial and viral illnesses. 2-4 days after birth, colostrums will be replaced by transitional milk.', 'role': 'assistant'}]