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The suffix that indicates a field of study is "-ology." This suffix is derived from the Greek word "logia," which means "study" or "discourse." In medical terminology, it is commonly used to describe various branches of knowledge related to the health sciences, such as "biology" (the study of life), "psychology" (the study of the mind), and "neurology" (the study of the nervous system). In each of these cases, the "-ology" suffix signifies a specific area of scholarly focus or discipline.

The other suffixes present different meanings: "-tomy" refers to cutting or surgical incision (as seen in terms like "anatomy"), "-itis" designates inflammation (as in "appendicitis"), and "-oma" denotes a tumor or abnormal growth (like "melanoma"). These do not convey the concept of a field of study, which is why "-ology" stands out as the correct choice.