Removing an option value should remove conditional rules for it?

When you have a select options component, for example with the options
A, B or C

And a condition that says:
If the field has 'C' then show field X

If you delete option 'C', then the condition becomes:
If the field has 'A' then show field X

It would be better if deleting the option triggered a window that prompts the user to delete or update the conditional statements. Just 'removing' the condition could break other parts (eg: in a multi-condition setup).