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
Which is the most abundant RNA molecule 
Select and explain. 
A. r RNA, B. t RNA, C. m RNA, D. mi RNA
A: r RNA
Answer: A: r RNA 
Explanation: r RNA (80%)
t RNA (15%)
m RNA (5%)
mi RNA (<1%)