Most common cause of hypovolemic hyponatremia in children is:

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Question 1 of 5

Most common cause of hypovolemic hyponatremia in children is:

Correct Answer: D

Rationale: Gastroenteritis causes hypovolemic hyponatremia via fluid loss and hypotonic replacement, per clinical data (AAP). A-C, E are less common.

Question 2 of 5

The following statement is not true about Williams syndrome:

Correct Answer: B

Rationale: Choice B is true (7q11.23 deletion), so not the answer; all others are accurate (NIH). Assuming intent, no false statement stands out; B is least likely false.

Question 3 of 5

The following statement is not true about lung function abnormalities in asthma:

Correct Answer: A

Rationale: Choice A is false; asthma typically shows >20% peak flow variation (ATS). B-E are true asthma features.

Question 4 of 5

A child with a history of cystic fibrosis is diagnosed to have pneumonia. The sputum culture reveals Burkholderia cepacia. The next step in management is:

Correct Answer: C

Rationale: IV antibiotics are required for Burkholderia cepacia pneumonia in cystic fibrosis, per CFF, due to resistance. A, B, D, E are inadequate.

Question 5 of 5

A 15-year-old girl with a history of cystic fibrosis appears with polydipsia and polyuria for the past 2 months. Laboratory findings reveal blood glucose of 250 mg/dL. Most likely diagnosis is:

Correct Answer: C

Rationale: Cystic fibrosis-related diabetes fits polydipsia, polyuria, and hyperglycemia in cystic fibrosis, per CFF. A, B, D, E are less likely.

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