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: smart watch with ecg and blood pressure
Product list:
A: YAMAY Smart Watch, Watches for Men Women Fitness Tracker Blood Pressure Monitor Blood Oxygen Meter Heart Rate Monitor IP68 Waterproof, Smartwatch Compatible with iPhone Samsung Android Phones (Black)
B: HalfSun Fitness Tracker, Activity Tracker Fitness Watch with Heart Rate Monitor, Blood Pressure Monitor, IP67 Waterproof Smart Watch with Sleep Monitor, Calorie Counter, Pedometer (Gray)
Answer: B,A