Question

what is the meaning of the word pertain as used in the passage? rob is studying veterinary medicine at university, so he often reads books and magazines that pertain to animal health issues. articles that relate to the latest medications and treatments available for horses are of particular interest to him, since he plans to be an equine veterinarian—a vet who specializes in the care of horses. to have similar opinions to have to do with to fit together

Explanation:

In the context, Rob reads materials related to animal - health issues. "Pertain to" means to be related to or have to do with. The other options don't fit the context.

Answer:

to have to do with