instruction:
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.
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Question: A few days ago, a friend and I were discussing how every "rule" of English spelling or pronunciation has an exception, and every exception has an exception as well. Then I brought up the rule of a ph cluster equaling an f sound (as in phonetic, elephant, morph, etc.) as a pronunciation rule that didn't have any exceptions I could think of. Is this a true hard-and-fast rule or does it have some exceptions as well? I'm not counting abbreviations such as pH scale. 
Answer: The exceptions come in two categories: Greek words that were originally pronounced with an "f" diphtheria, diphthong, ophthalmology, phthisis but have come to be pronounced with a "p" by no process I understand. Compound words uphold, saphead, peephole that are just a word ending in "p" run up against a word beginning with an "h". Neither of those really feel like exceptions: mispronunciations that have become accepted and two words being treated as one. Then there is aphelion. Arguably, that's a compound word and a mistake. By analogy with apogee and apastron, it should be apohelion: "apo" ("from") + "helion" ("sun"). Several people brought up "Stephen", which is often pronounced like "Steven". Eh, I think we should play with Scrabble rules: no proper names. Finally, there is an example that will really blow your minds: phthalate. The ph- is silent.
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yes


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Question: For example, many different religions say that their members can't partake in eating certain kinds of food like shellfish, pork or beef. What is a name for a general rule of this nature across religions? People don't "need" to do them as it is their choice to follow a religion, but still, doing something such as restricting one's diet can be a requirement of a religion itself. 
Answer: May I suggest the words "Proscribed" and "Transgression"? eg: "Damon read the proscribed literature, even though he knew it to be a transgression against his beliefs.".
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no


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Question: A few years ago I was told not to use that word because, in addition to its negative meaning, it comes from Latin denigratus, past participle of denigrare, which means to blacken. Therefore, "to denigrate someone" would be "to blacken that person". Considering its current definition (see below) and the wish to be politically correct, I wonder whether the word has come to acquire any racist overtone. The reason why I'm asking is because I was reading "Language Myths" a book by Laurie Bauer recently, and came across this passage which contained that word "...certain educational institutions denigrate the way certain ethnic minorities and lower-working-class children talk." Then I remembered I was once told not to use "denigrate" as it might be misinterpreted by some people. denigrate - from Merriam-Webster 1. to say very critical and often unfair things about (someone) 2. to attack the reputation of, to deny the importance or validity of, belittle EDIT (on Dec 17th, 2017) - This article, Dark Words Of Disapproval which Mari-Lou A mentions in one of the comments, shows very clearly the writer's feelings about this word, with very good arguments to bear him out. Then again, there are those who think otherwise. For one, Melvin B. Tolson, the character played by Denzel Washington in the 2007 feature film "The Great Debaters", says the word has racist undertones. - Edit (on May 6th, 2020) 
Answer: I don't see why this question has received such negative responses. I think it's a good question. "Blacken" indeed has a trans-historical meaning associated with vilification or corruption, but this has nothing to do with the inherent qualities of black people, animals, or the vast majority of black things. Would you consider the term "blacklist" racist? If not, then you shouldn't see "denigrate" as racist. Anyone who does is being a little silly. If you're worried, you could always replace it with "disparage." EDIT: Another example is use of the term "sinister" to mean "wicked." This word comes from Latin "sinister," meaning "left" or "on the left side." Over time, the mythologized connection of the left hand to the false or unfavorable came to give "sinister" an association with the unsavory. This does not mean that we cannot use "sinister" to mean "wicked," or that doing so would impugn left-handed people.
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yes