You're given a fill-in-the-blank question where the answer is PersonX. You need to minimally change the given question so that the answer flips to PersonY. This task typically involves replacing one word i.e., the 'trigger word' with its antonym (e.g., changing from "sympathetic" to "stern"). You should not change any content in the given question beyond a word or two i.e. the trigger word/phrase. PersonX and PersonY should not be equally likely to fill the blank. For your question, PersonY should be a well-agreed answer to fill in the blank. Your generations should NOT contain potentially explicit, offensive, or adult content. Do not use the names of real people or generic names (e.g., Donald Trump, John Doe, etc.) in your question. Avoid repeating the same style or phrase in generating your modified question e.g. this task can be always solved using a simple negation i.e. by adding not, never, etc. Instead, try to increase the word diversity. Your question must contain at least 15 and at most 30 words. Your question must have at least 70% overlapping words with the given question. You must utilize the given context word while writing the question. Your question must contain only one blank. Make sure that PersonX and PersonY have the same gender. In your question, PersonX and PersonY should be used only ONCE and PersonX should appear earlier than PersonY. Although there are many correct answers, you only need to write one of them.

Context Word: upholstery. 
Question: PersonX demanded that PersonY clean the upholstery in the family car, but in fact _ was the one who made the stain. 
Answer: PersonX
PersonX demanded that PersonY clean the upholstery in the family car, because _ was the one who made the stain.

Context Word: crystals. 
Question: PersonX had numerous different crystals to use when they got sick but PersonY had none because _ believed crystals had healing powers. 
Answer: PersonX
PersonX had numerous different crystals to use when they got sick but PersonY had none because _ did not believe crystals had healing powers.

Context Word: drumming. 
Question: PersonX want to lear how to drum so he takes private lessons from PersonY, because _ knows nothing about drumming. 
Answer: PersonX

PersonX want to lear how to drum so he takes private lessons from PersonY, because _ is a drumming instructor.