Instruction: Evaluate the relevance of each product title in the input to the given query, and then sort the products in descending order of relevance, placing the most relevant product at the top of the ranked list.

Input:
Query: dht blocking shampoo
Product list:
A: PURA D'OR Biotin Original Gold Label Anti-Thinning (16oz x 2) Shampoo & Conditioner Set, Clinically Tested Effective Solution w/ Herbal DHT Ingredients, All Hair Types, Men & Women (Packaging Varies)
B: HairStem DHT Blocker Hair Growth Shampoo Products with Biotin, Saw Palmetto - Clinically Developed - Hair Loss Products Treatments- 10oz
Answer: B,A