Instruction: Evaluate the titles of Product 1 and Product 2, then choose the option that best describes the relation between the two products.

Input:
Product 1: Hydronix CB-45-1005 NSF Carbon Block Filter 4.5&quot; OD X 9 7/8&quot; Length, 5 Micron
Product 2: Hydronix SPC-45-1020 Polyester Pleated Filter 4.5&quot; OD X 9 3/4&quot; Length, 20 Micron

Options:
A: Users who buy product 1 may also buy product 2.
B: Users who view product 1 may also view product 2.
C: The product 1 is similar with the product 2.
Answer: A