Overuse of β2-agonists implies inadequate control. Poor control is suggested by the use of more than

Correct Answer: C

Rationale: Using more than 8 puffs per day suggests poor asthma control, necessitating medication adjustment.

Correct Answer: C

Rationale: Metabolic acidosis due to bicarbonate loss triggers respiratory compensation via hyperventilation (Kussmaul breathing) to reduce CO2 levels.

Correct Answer: A

Rationale: A sunken fontanel is a classic sign of severe dehydration in infants, indicating significant fluid loss and the need for immediate hydration.

Correct Answer: D

Rationale: Dennie-Morgan folds are characteristic infraorbital creases seen in children with atopic dermatitis or allergic rhinitis.

Correct Answer: C

Rationale: During the first 6 months of life, infants believe that objects exist only as long as they can see them. When infants