human
Detect the tone of the below sentence. Answer in the either formal or informal only.\nDecreasing sliding speed can increase lubricating film thickness, and the thickest lubricating film (approximately 125 nm) is achieved at a sliding speed of 0.
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
Yes
3. If two experts were independently asked the question, will the final answer be exactly the same?
Yes

--- Answer ---
grounded