Ok so I have tried to register to a port forum to help me determine the age of an old bottle of port I aquired recently, my problem is that I cant get past the human/robot question, guess I know sweet FA about port then.
Anyone here know the answer to this?

Jerez is to Porto as what is to Port?

I may not register on principle, i cant even get google to help, I just want to know the answer after many failed attempts, i am feeling very stupid right now...