Validate that exposed primary/foreign keys in a form are intact

I have a Survey form. Every question has 3-4 pre-defined answers as radio buttons. The value of a radio button is the primary key of the answer in the database.

As all answers to all questions are stored in one table, if a user increments the value, the ID may still be a valid foreign key, but it does not belong to that question.

What's the best practice to be sure the value of the radio button is not manipulated?

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