Yes, we have no bananas

Dear fellow speakers of English.

I was asked by a Japanese colleague about the meaning of the following question and answer:

Q: Is there no exclusive relationship?
A: Yes.

In this case, given only the above information, does the answer mean

"Yes, there is no exclusive relationship"
or
"Yes, there is an exclusive relationship"

Likewise if the answer were simply "No."

And this reminded me of the famous song "Yes, we have no bananas."

If a customer at a grocery store were to ask "Do you have no bananas?" presumably "Yes" means "Yes, we have no bananas." Right?

I'm a little confused.

via International Skeptics Forum https://ift.tt/RrX3Idq