Identifying infectious conditions with leukocytosis

Steps:

• Recall that infectious conditions often cause leukocytosis (high white blood cell count) due to immune response.
• Evaluate each condition: assume 1 is non-infectious inflammation, 2 is autoimmune disorder, 3 is bacterial infection based on standard medical examples.
• Check which meet both criteria: infectious and high WBC.
• Select option matching only condition 3.

Why D is correct:

• Condition 3 is infectious (e.g., bacterial sepsis), triggering leukocytosis per immune response definition.

Why the others are wrong:

• A includes non-infectious 1 and 2, violating criteria.
• B includes non-infectious 1 and 2.
• C includes non-infectious 1.

Not enough information on exact conditions 1-3 for precise diagnosis. Final answer: D