Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: Are there any differences between "oval" and "ellipse"? 
Answer: To me the defining difference is this: An oval can be made from two radiuses. That is, you can make an oval using your compass (or parts of a circle, if you like). You can never do this with an ellipse. That is, no part of an ellipse will ever make a circle.

no