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: Pathology
[{'content': 'The approximate number of genes contained in the human genome is: \nSelect and explain. \nA. 40,000.00, B. 30,000, C. 80,000.00, D. 1,00,000.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . 30,000', 'role': 'assistant'}]