GPT-3 is a general language model, trained on a large amount of uncategorized text from the internet. It isn’t specific to a conversational format, and it isn’t trained to answer any specific type of question. The only thing it does is, given some text, guess what text comes next.
Ofer Razon wrote: GPT-3 discussions are all over the network now, and while we all see some mind-blowing use cases that tease our mind what can come next, we also get to see the pitfall of AI/ML systems. Put in simple words – it doesn’t know how to say “I don’t know”.  This article “Giving GPT-3 a Turing Test” is a must-read!  Link