Ashley and Stella are correct.
Organ is kidney, spleen, pancreas, brain, eyes. Some people believe lung is organ, some don't. Some believe that reproductive organs are organ, some don't. Stomach is fed as meat (tripe).
50% of the organ allotment is always liver (vary species if you can...chicken, turkey, beef, pork) and the other half can be any of the other organs. Kidney is the easiest for most people to find.
"Having heard all of this, you may choose to look the other way.....
but you can never say again that you did not know." William Wilberforce 1759-1833