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For the specific example you are describing, what you want to do is make the field "if other, please explain" as a mandatory field and make it part of the field dependency for category = other (just like going from category to sub-category).
For other scenarios, such as making a field option for other values, but required for some values, it is not possible. There is a workaround using duplicate fields and extra business rules, but I don't recommend it due to complexity unless it was a critical requirement (which is almost never is). For that, you'd have to vote on this idea: FP12 - Ability to set permission based on the value of a dropdown field
Thanks Nicolas! That will work fine for this scenario.
I appreciate the quick response!