Instruction: Predict whether two products are similar, whether two products are likely to be purchased or viewed together based on their titles. Choose your answer from the provided options.

Input:
Product 1: Sigma EF-530 DG Super Electronic Flash for Pentax and Samsung DSLR
Product 2: Sigma EF-610 DG ST Electronic Flash for Pentax Digital SLR Cameras

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: B