Combining form meaning 'blood' used in medical terms?

• A. Cardi/o
• B. Hemat/o
• C. Nephr/o
• D. Rhin/o

Answer: (B)

The main idea is identifying the combining form that means blood. Hemat/o comes from Greek haima, and it’s the element used in medical terms to denote blood. That’s why you see words like hematology (the study of blood), hematoma (a bruise or blood collection), and hematopoiesis (formation of blood cells) built with this root. The other options point to different body parts—cardi/o is heart, nephr/o is kidney, rhin/o is nose—so they don’t convey the blood sense. Hemat/o is the accurate piece to indicate blood in medical terminology.