All are lines of treatment for hyperkalemia Except:

Correct Answer: B

Rationale: Beta blockers do not directly treat hyperkalemia, whereas other options help lower serum potassium through intracellular shifts or excretion.

Correct Answer: D

Rationale: Vegetable matter, such as nuts, is the most common foreign body aspirated by children due to its size and texture.

Correct Answer: C

Rationale: The anion gap reflects unmeasured anions in plasma. It is calculated as Na+ - (Cl- + HCO3-) and helps differentiate types of metabolic acidosis.

Correct Answer: B

Rationale: Normal anion gap metabolic acidosis is caused by bicarbonate loss, such as in diarrhea, where excessive bicarbonate is lost through stool, leading to acidosis.

Correct Answer: C

Rationale: Rescue breathing should be prioritized in drowning cases to restore oxygenation before considering other interventions.