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The suffix -ologist is commonly used to denote an individual who specializes in a specific field of study or practice, particularly within the realms of science and medicine. It signifies expertise in a particular area, such as a biologist, who studies living organisms, or an ophthalmologist, who specializes in eye care and treatment. This direct association with specialized knowledge and practice makes it clear that option B accurately describes this common usage of the suffix.

Understanding the context of the other options provides clarity on their meanings but does not relate directly to the expertise implied by -ologist. For instance, a condition of swelling is typically described using other suffixes, such as -itis or -edema, while abnormal conditions are denoted with -osis. Likewise, fears of examination are represented through a different set of terms, such as -phobia. These different contexts highlight the distinguishing characteristic of -ologist as an indicator of specialization and expertise.