I have literally told a HR person "I'm not answering this question" and when told to do or cancel, I cancelled that application with zero regrets.
Remember: Whenever someone in HR tells you "this is a standard question", immediately assume that means "we can get away with asking this, and it's strictly to our advantage, so we always do".
Remember: Whenever someone in HR tells you "this is a standard question", immediately assume that means "we can get away with asking this, and it's strictly to our advantage, so we always do".