Instruction: Given the title of two products, predict if the two products are similar, if the two products will be purchased or viewed together. Answer only from the options.

Input:
Product 1: SainSmart MQ7 4P 180mA 5V DC Gas Tester Carbon Monoxide Detecting Sensor Module Detector for Arduino
Product 2: Waveshare Dust Sensor Detector Module with Sharp GP2Y1010AU0F Onboard for Measuring PM2.5 Air Purifier Air Conditioner Monitor Supports Arduino

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