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': 'Which one of the following is false about mi-RNAs? \nSelect and explain. \nA. Can encode proteins, B. 21-30 nucleotides in length, C. Discovered by Andrew Fire and Craig Mello, D. Inhibits gene expression', 'role': 'user'}, {'content': 'Answer: A \nExplanation: mi-RNAs do not encode proteins.', 'role': 'assistant'}]