Data Entry + Trigger

Is there a way to make the value that needs to be entered not 100 % of what the user writes but focus on a key word. For example I ask a question. "How do you treat a ankle injury?" There is a few possible answers. If the user types in {ice the ankle} I want it to recognize just the word [ice] and allow them to pass the condition test. or if they write something longer like: { I will now ice the ankle} it will not throw off the condition test?

I'm trying to have a write in branching quiz. If they answer the question one way it will take them to another slide if they answer it another it will take them to another slide when they click next. 

The questions are a little opened needed and I don't want the users needing to match whats in the condition test exactly. 

Thanks for any help you can give.