system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Beef comes graded in prime, choice, select, etc. but chicken, pork, and other meats don't seem to have this distinction. Why?
gpt
At least for chicken, there are grades! It’s just A, B, and C though. 

Grade A chicken is the kind you buy at retail. Grades B and C are used for ground meat or other processed products. 

With beef products the grading describes the physical quality of the meat. Things like fat content, distribution, etc., and is legitimate tiers of meat. Ranging from “cheap but serviceable” with a poor fat content or muscle structure, to “high quality expense” with ideal meat and fat structure. 

With poultry, since we only really cook and eat Grade A from the store, any grading would be arbitrary. It would be difficult to pin down any qualities that make one piece better, at least better enough to warrant grading. 

I’m unsure of pork and the others, though.