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: Physiology
[{'content': 'In the entire human genome, coding DNA constitutes? \nSelect and explain. \nA. 2%, B. 1%, C. 0.10%, D. 4%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. 2%', 'role': 'assistant'}]