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.

Ex Input:
Question: What is the shortest comprehensive sentence in English? 
Answer: No. Also Q: Which is the fifth letter of the alphabet? A: E.

Ex Output:
no


Ex Input:
Question: In my language, when I write an email to my professor, boss, etc, there is a greeting part in the first part of email right after "Dear prof. ..."(in my language of course), e.g. "How are you", "I hope everything is alright" and so on. But I don't have any idea how can I write a proper email with such a greeting in English? Or do I have to ignore it because the email is kinda formal? 
Answer: I almost always start formal e-mails with Dear Professor _, I hope this note finds you well. Some guidelines will suggest ending your salutation with a colon rather than a comma, but in many circumstances a comma is acceptable. If the person's title is "professor," you should spell it out (not "prof.") and begin it with a capital letter when it precedes the person's name (as it would in your example). "I hope this note (or letter) finds you well" politely establishes a friendly connection between you and the recipient of your letter and in most circumstances is a great way to start it. Especially if you're asking for something, it's good to indicate your concern for the person you're writing to. For the same reason, it's a good idea to end the letter with a phrase or sentence that will similarly show interest in their work or their well-being. "Best regards," is fine, but if you can tailor it in a way that's a bit more thoughtful, it's better. "I hope your book/project continues to go smoothly." (This can be followed by a "Best regards.") If this is a person you don't know, you may have to settle for a generic "Best regards" alone.

Ex Output:
yes


Ex Input:
Question: When someone says I stand corrected. What does that mean? 
Answer: It means "I admit that I was wrong". See e.g. Cambridge Dictionaries: used to admit that something you have said or done was wrong I stand corrected - the date of foundation was 1411, and not 1412 as I had written. Or Wiktionary: Said to acknowledge someone who corrects something that one says or writes that was not correct. The Battle of Hastings was fought in 1056. No it wasn't! Look in the textbook! Oh, sorry. I stand corrected - it was fought in 1066. Note that the Cambridge Dictionary marks this idiom as "formal", and Merriam-Webster's Learner's Dictionary as "somewhat formal".

Ex Output:

yes