They need to add a way to tell the system it has a bad question/answer combination (in case any of the devs are on here).

Example:

Question 2: What is the branch of science that studies the composition, properties, reactions and the structure of organic compounds?

I responded with Organic Chemistry, but it only accepts the answer Chemistry. While technically true, if someone is trying to learn, then this is misleading. That question specifically defines the organic branch of chemistry, but does not define it as a whole.