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
Which one of the following is false about mi-RNAs? 
Select and explain. 
A. Can encode proteins, B. 21-30 nucleotides in length, C. Discovered by Andrew Fire and Craig Mello, D. Inhibits gene expression
A: Can encode proteins
Answer: A: Can encode proteins 
Explanation: mi-RNAs do not encode proteins.