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.

Question: This question comes from a quiz but I could not find the correct answer. 
Answer: The indefinite determiner "a" represents all things in a given category rather than the more specific definite determiner "the". So, if you were to ask me, "Every Hiker climbed a hill" represents a specific group of hikers who climbed non-specific hills and not the same hill. If the sentence said, If every hiker had climbed the hill, it would be only one hill.
no

Question: Does "egoistic" and "egotistic" mean the same thing? 
Answer: An "egotist" thinks that the world revolves around him/her. An "egoist" is a petty soul, disregarding of the rights and needs of others. It is synonymous with "selfish person".
no

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