Identifying white blood cells by morphology

Steps:

• Assess cell X: small round nucleus nearly filling cell with thin cytoplasm rim.
• Assess cell Y: largest cell with kidney-shaped nucleus and abundant grayish cytoplasm.
• Assess cell Z: medium size with multi-lobed nucleus and fine granules.
• Match features to standard types: lymphocytes (small, round), monocytes (large, indented), neutrophils (lobed, granular).

Why A is correct:

• Aligns with hematology definitions: lymphocytes have high nucleus-to-cytoplasm ratio; monocytes are largest with U-shaped nuclei; neutrophils show 3-5 lobes.

Why the others are wrong:

• B: Confuses Y (large, non-granular) as neutrophil, which requires lobed nucleus.
• C: Mislabels X (small) as monocyte, ignoring size and shape differences.
• D: Misidentifies X (round nucleus) as neutrophil, which has segmented lobes.

Final answer: A