A child presents after a fall, which occurred while running. While falling, the child attempted to brace against the fall using his hands in dorsiflexion. There is tenderness over the wrist. Which is the most likely diagnosis?

Correct Answer: B

Rationale: A torus (buckle) fracture of the distal radius is common in children falling on an outstretched hand, causing wrist tenderness.

Correct Answer: C

Rationale: Gastroenteritis is the most common cause of hypokalemia in children due to potassium loss via diarrhea.

Correct Answer: D

Rationale: Aluminum binders are avoided in chronic renal insufficiency due to toxicity; others are standard treatments.

Correct Answer: D

Rationale: Hypotension can impair ventilation, causing CO₂ retention and respiratory acidosis.