The diurnal variation in Peak Expiratory Flow (PEF) that is consistent with asthma is more than

Correct Answer: B

Rationale: Diurnal PEF variability of more than 20% is characteristic of poorly controlled asthma, indicating increased airway reactivity.

Correct Answer: A

Rationale: The symptoms and physical findings (boggy, pale nasal edema with clear discharge) are classic for allergic rhinitis.

Correct Answer: A

Rationale: HLA-B27 is strongly associated with ankylosing spondylitis, an inflammatory condition affecting the spine.

Correct Answer: C

Rationale: TTN is caused by delayed clearance of fetal lung fluid, leading to mild respiratory distress. Oxygen therapy and CPAP help maintain oxygenation while the condition resolves within 24-72 hours without requiring aggressive intervention.

Correct Answer: C

Rationale: Iron deficiency anemia is microcytic and hypochromic, not normocytic normochromic, which is seen in conditions like hemorrhage and bone marrow failure.