A combining form that indicates the liver is?

The correct answer is the combining form "Hepat/o," which specifically refers to the liver. In medical terminology, combining forms are used to build words related to specific organs or systems. "Hepat/o" derives from the Greek word for liver and is commonly used in various medical terms related to liver conditions, such as hepatitis (inflammation of the liver) or hepatomegaly (enlargement of the liver).

The other options correspond to different organs: "Nephr/o" pertains to the kidneys, "Pneum/o" refers to the lungs or air, and "Cardi/o" relates to the heart. Each of these combining forms is specific to its respective organ and is not interchangeable with "Hepat/o." Understanding these distinctions is crucial for accurately interpreting medical terminology and effectively communicating in the field of health care.