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: Biochemistry
[{'content': 'The recommended dietary allowance\xa0of Calcium\xa0for pregnant females is: \nSelect and explain. \nA. 1000, B. 1200, C. 1500, D. 1300', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]