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: beta sitosterol nature bound
Product list:
A: Source Naturals Mega Strength Beta Sitosterol 375mg Plant Sourced Healthy Cardiovascular & Cholesterol Support Supplement - 240 Tablets 
B: Saw Palmetto Prostate Supplements for Men as Potent DHT Blocker for Hair Growth and Beta Blocker to Decrease Frequent Urination (100 Count, Day Time)
Answer: A,B