Which term describes the branch of medicine dealing with blood?

• A. Gastrointestinal
• B. Hydration
• C. Hematologic
• D. Infection

Answer: (C)

Hematology is the branch of medicine that studies blood, its components, how it clots, and disorders like anemia or leukemia. The term hematologic is the adjective form used to describe anything related to blood, so it correctly names the field in this context. The other options point to unrelated areas: the gastrointestinal system handles digestion, hydration concerns body fluids, and infection deals with pathogens. Because the question asks for the term describing the blood-focused field, hematologic fits best.