Ballad of John & Yoko

Does anyone know who played bass on the Beatles recording of “The Ballad of John & Yoko”? (Hi Pat - Bill).

Paul and John were the only Beatles involved, so it’s probably Paul.

My understanding is: Paul on bass and drums, John on guitars.

It had to be Paul, John’s bass playing (heard on “The Long and Winding Road”) was rather sloppy.

…by the way, I forgot about this site, which should answer all such questions.
http://www.icce.rug.nl/~soundscapes/DATABASES/AWP/tbojay.html