Identifying white blood cells by morphology

Steps:

• Examine nucleus shape: neutrophils have multi-lobed (3-5 lobes), lymphocytes have large round, monocytes have kidney-shaped or indented.
• Assess cytoplasm: neutrophils show fine granules, lymphocytes have thin rim, monocytes have abundant grayish cytoplasm.
• Match X to multi-lobed nucleus with granules (neutrophil).
• Match Y to round nucleus with scant cytoplasm (lymphocyte), Z to indented nucleus with ample cytoplasm (monocyte).

Why D is correct:

• D assigns neutrophil (multi-lobed nucleus, granules) to X, lymphocyte (round nucleus, thin cytoplasm) to Y, and monocyte (indented nucleus, abundant cytoplasm) to Z, matching standard histological definitions.

Why the others are wrong:

• A misassigns monocyte to Y (lacks indented nucleus).
• B misassigns monocyte to Y and neutrophil to Z (reverses granular and indented features).
• C misassigns monocyte to X (ignores multi-lobed nucleus).

Final answer: D