Which suffix is used to denote "pertaining to"?

The suffix that denotes "pertaining to" is indeed the one that is correctly identified. This suffix is commonly used in medical terminology to describe characteristics, qualities, or relationships associated with a particular subject or type of condition.

For example, the suffix "-ic" can be found in words like "gastric," which means pertaining to the stomach. In the context of medicine, this suffix helps to convey that something is directly related to a specified organ or system.

The other options do not provide that specific meaning. The suffix "-ical" also implies "pertaining to," but it's generally used in a more specific context, while "-ology" refers to the study of a subject, and "-ist" denotes a person who practices or is skilled in a particular field. This distinction helps clarify why the indicated suffix is the most fitting choice for the meaning "pertaining to."