Have you ever make a survey question with answers like
Yes, with coke
Yes, with beer
With this kind of choices within a form, should you add a period after the answer? Or just leave it like above?
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I would address this as a bulleted list.
The Plain English grammar wonks have clear guidelines on punctuating the bulleted lists. According to them, your form qualifies as "a list of very short points" which do not need to end with a period.
Oxford Dictionaries agrees that "if the bullet point is not a proper sentence, it doesn’t need to ... end with a period".