Instruction: Rank the products A, B, C, ... based on their relevance to the provided query, and produce a ranked list with the most relevant product positioned at the top of the list.

Input:
Query: breast ultrasound registry review elderman
Product list:
A: The Ultimate Guide to the ARDMS SPI Exam
B: Breast Sonography Review: A Question & Answer for the ARDMS Specialty Exam
C: Ultrasound Review OBS & GYN
Answer: B,C,A