I don’t know how to answer “box 18 a payment from SPP or a money purchase RPP?” On my T4A, how do I figure that out?

I have my T4A from Investors Group Trust Co Ltd and box 18 has $1k in it, but as I’m filling my taxes there’s that one question that I’m asking about that I just don’t understand, I’m very new and I’m not knowledgeable on this so any help would be greatly appreciated.