Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: black hitch ball
Product list:
A: Reese Towpower 21512 Multiple-Ball Ball Mount,Black,Medium
B: CURT 45056 Trailer Hitch Mount with 2-Inch Ball & Pin, Fits 2-In Receiver, 7,500 lbs, 4-Inch Drop
Answer: A,B