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: Dental
According to ADA specification of a tooth-brush, which of the following is false? 
Select and explain. 
A. Head of the brush should be 2 inches long, B. 2-4 rows of bristles, C. 5-12 tufts per row, D. 80-86 bristles per tuft
A: Head of the brush should be 2 inches long
Answer: A: Head of the brush should be 2 inches long 
Explanation: None