Me a [25F] med student with my non-medical BF [26M] who won't stop asking questions

BF was one of those who wanted to go to med school til he took a few weed-out pre-med classes...Now he is in a non-science field and constantly asks me incessant questions.

He'll be watching television, see some character has some disorder, ask what causes the disorder, ask about the drugs that treat it, ask about the mechanisms for the drugs, ask why the show isn't giving those drugs and how the drugs that show is giving actually work and why that's wrong and what would happen in real life if we did that, and on and on and on...

I feel like I'm constantly being pimped. ["Pimping" is when a superior (resident/fellow/attending) who's evaluating you asks you medical questions. It's one of the ways clinical medicine has been taught/tested for ages...and can at times be extremely stressful.]

BF will also come to me with off the wall claims ("My coworker told me that zinc prevents all colds and 8 different types of cancer. How come you doctors don't have everyone on zinc?") and he won't leave me alone until I look into zinc and give him some reason that he finds satisfactory. The baseline assumption is always that his non-medical coworker is correct and I have to defend why "all us doctors" are/aren't doing xyz.

I've explained that this is not how I want to spend my little time off from the hospital.

When I have to look something up to shut him up, he tells me I'm lucky to be in med school and I should be happy that I'm learning things when I look them up to answer him.

I feel small, I don't usually feel small, and I can't figure out where exactly the problem is here.

I know I am lucky to be in med school.

I also feel super frustrated and like I'm being pimped in my own home.

Am I just being stupidly defensive? Should I just...know more things than I do? Does anyone have a good method for dealing with this $hit?

tl;dr: Med student. I answer questions all day long at work. BF won't quit with more incessant questions at home. Also demands answers to Dr. Oz-esque claims. This pisses me off, bf reasons it shouldn't, I'm frustrated and confused. Am I just too defensive and/or not enough of an intellectual?