Identifying blood cell X by morphological features

Steps:

• Observe cell X's large size, irregular nucleus, and granular cytoplasm in the photomicrograph.
• Compare to standard blood cell types: lymphocytes are small and round, while larger cells with engulfing capability indicate phagocytes.
• Rule out specific lymphocyte subtypes (A, D) due to lack of small, dense nucleus.
• Confirm X as a functional phagocyte, like a monocyte or neutrophil, based on appearance.

Why C is correct:

• Phagocytes are white blood cells specialized for engulfing pathogens via phagocytosis, matching X's large, active morphology as defined in hematology.

Why the others are wrong:

• A: B-lymphocytes are small, round cells producing antibodies, not large or phagocytic.
• B: Monocytes are a specific phagocyte subtype, but X's features fit the broader phagocyte category without precise monocyte identification.
• D: T-lymphocytes are small effector cells for immunity, lacking X's size and engulfing traits.

Final answer: C