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.

[Q]: Question: I just realized that I've never needed to use 31th or 31st in my four years English study. So which one is correct, and what about other alternatives? 31th or 31st 101th or 101st 1001th or 1001st Can I also use that way everywhere in the same way (for example, ordinal numbers in math)? 
Answer: 31st, etc. are the correct options. When you use ordinal numbers ending in 1, you use first. The only exception is eleventh, because although it ends in 1 its "name" doesn't contain the word "one" like 21, 31, etc.
[A]: no


[Q]: Question: What's the verb for "to drink small amounts of drink" (especially to enjoy it as slowly and long as possibly)? What's the drinking equivalent of "nibble"? 
Answer: To sip conveys the idea: to drink, taking only a very small amount at a time: This tea is very hot, so sip it carefully. She slowly sipped (at) her wine. Cambridge Dictionary.
[A]: no


[Q]: Question: Does "egoistic" and "egotistic" mean the same thing? 
Answer: No. While similar, they have some important differences. Consider this note on usage from the Oxford Dictionaries: The words egoism and egotism are frequently confused, as though interchangeable, but there are distinctions worth noting. Both words derive from Latin ego ('I'), the first-person singular pronoun. Egotism, the more commonly used term , denotes an excessive sense of self-importance, too-frequent use of the word 'I,' and general arrogance and boastfulness. Egoism, a more subtle term , is perhaps best left to ethicists, for whom it denotes a view or theory of moral behavior in which self-interest is the root of moral conduct. An egoist, then , might devote considerable attention to introspection, but could be modest about it, whereas an egotist would have an exaggerated sense of the importance of his or her self-analysis, and would have to tell everyone.
[A]:
yes