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: Medicine
[{'content': 'Highest calcium Concentration is present in \nSelect and explain. \nA. Dates, B. Guava, C. Amla, D. Halibut Liver oil', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]