Which combining form means yellow?

• A. Eti/o
• B. Xanth/o
• C. Calc/i
• D. Carcin/o

Answer: (B)

The main idea here is recognizing a combining form that denotes color, specifically yellow. The form xanth/o comes from a Greek word meaning yellow, and it appears in terms like xanthoderma (yellow skin) or xanthochromia (yellowish color of body fluids). That makes it the correct choice for indicating yellow.

The other forms convey different ideas: eti/o relates to causation or etiology (the cause of disease), calc/i relates to calcium or lime and is used in terms like calcification or calculus (stone), and carcin/o refers to cancer (carcinoma).