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': 'Total number of genes in a human being is \nSelect and explain. \nA. 800000, B. 50000, C. 100000, D. 30000', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Current estimates suggest that there are 25,000 protein-coding genes in humans. This implies that most of the DNA is non-protein-coding, i.e. its information is never translated into an amino acid sequence of a protein molecule.', 'role': 'assistant'}]