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: The numerals with endings are merely abbreviations for the words written out as text. When in doubt, write the word out. Thirty-first becomes 31st, eleventh 11th, forty-second 42nd, fiftieth 50th, and so on.

A: yes
****
Q: Question: I've been looking around the Internet. Some websites say that foods is incorrect but others say it is correct.
Answer: Food in its commonest sense is a non-countable noun, with all the effects of that. It's already a plural. You would eat "some food" not "a food". You would say "less food" not "fewer foods". However, there is a less common usage where "a food" means "a type of food": "Cheese is a food made from milk" ... and in this form, you can pluralise it ... "Italy is the source of many delicious foods -- pizza, pasta, salami, biscotti..." For comparison, think of "a people" - Are there meta-plurals beyond "peoples"?.

A: yes
****
Q: Question: Persistence and perseverance seem to have very similar definitions. Googling shows persistence: Firm or obstinate continuance in a course of action in spite of difficulty or opposition. perseverance: Steadfastness in doing something despite difficulty or delay in achieving success. What is the difference between them?
Answer: "Persistence" is used in the sense of "stubborn" (obstinate). There could be a slight negative connotation. For example: The telemarketers persistently called us. We don't say they "perseverantly" called us. "Persistent" is used when there continuing action, and the purpose is either bad, or neutral, and sometimes(rarely) good. "Perseverance", is used when the purpose is good. That is, you're doing something to help someone, or to achieve a desirable goal, such as climbing Mt. Everest. Depending on how you feel on something, you could use "perseverance"/"Persistence". For example, the telemarketer calling you, could annoy you, and you could call him "obstinately persistent". But to the marketer, you might be to him, a tough customer, and he might seem to himself "bravely perseverant in trying to persuade this tough customer." As you can see, it gives a different "feel" about the thing described.

A:
yes
****