The most common congenital cyanotic heart disease in newborn is:

Correct Answer: C

Rationale: D-Transposition of the great arteries is the most common congenital cyanotic heart defect in neonates. It presents with severe cyanosis and requires early intervention to establish adequate mixing of oxygenated and deoxygenated blood.

Correct Answer: B

Rationale: Rapid correction of hypernatremia can cause cerebral edema. The recommended safe correction rate is no more than 12 mmol/L per 24 hours.

Correct Answer: B

Rationale: Renal tubular acidosis causes normal anion gap acidosis because it results from impaired renal acid excretion rather than accumulation of organic acids.

Correct Answer: C

Rationale: Addison's disease causes hyperkalemia due to aldosterone deficiency, leading to reduced renal potassium excretion.

Correct Answer: D

Rationale: Skin prick tests and specific IgE tests can help identify relevant allergens.