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: Social & Preventive Medicine
[{'content': 'In which one of the following is the calcium content of milk lowest – \nSelect and explain. \nA. Human milk, B. Goat milk, C. Cow milk, D. Buffalo milk', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]