What is the most appropriate diagnosis for a 7-year-old boy with recurrent motor movements?

Correct Answer: C

Rationale: Persistent Tic Disorder involves motor or vocal tics that last for more than a year. Tourette's Disorder requires both motor and vocal tics, while Provisional Tic Disorder lasts less than a year. Sydenham Chorea is typically associated with rheumatic fever.

Correct Answer: A

Rationale: Hypernatremic dehydration occurs when water loss exceeds sodium loss, leading to increased serum osmolality (>295 mOsm/L) and sodium levels (>145 mEq/L). This can result from inadequate fluid intake, excessive sweating, or osmotic diuresis.

Correct Answer: D

Rationale: Spirometry is the best test to assess obstructive lung diseases such as asthma. It evaluates airflow limitation and reversibility with bronchodilators, helping confirm the diagnosis.

Correct Answer: D

Rationale: Early postnatal dexamethasone is associated with adverse effects such as metabolic derangements, poor growth, and increased infection risk, but it is not directly linked to cerebral palsy. The other options are known risks.

Correct Answer: C

Rationale: Platelets typically survive for about 10 days before being removed by the spleen.