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.
One example: Question: What's the difference between the following examples: Neither of my teachers are mathematicians. None of my teachers are mathematicians. 
Answer: Neither - not either - implies that there is a choice of only two. So 'neither of my teachers' is only correct if there are exactly two teachers, 'none of my teachers' can be any number.
Solution is here: yes
Explanation: The answer is well in context with the question and gives a proper explanation to resolve it. Hence, the output "yes" is correct.

Now, solve this: Question: I often hear US citizens say something like this: <Some phrases>. Period. What does period mean when it appears in a sentence by itself in this type of situation? 
Answer: Period at the end of the sentence means, the things said in the sentence are definite and no change is allowed. For example, "I want the document without any errors, period" meaning that there should not be any errors in the document.
Solution:
no