Correct Answer: C

Rationale: The primary factor in selecting drugs for the treatment of a lower respiratory infection in Baby John is the sensitivity of the organism causing the infection. The choice of antibiotics should be guided by the susceptibility of the specific pathogen to ensure effective treatment and prevent resistance.

Correct Answer: C

Rationale: The classical clinical manifestations of diabetes mellitus include polyuria (increased urination), polydipsia (excessive thirst), and weight loss. Diabetic ketoacidosis is not a classical manifestation but rather a serious complication that can occur in individuals with uncontrolled diabetes.

Correct Answer: B

Rationale: The most appropriate nursing diagnosis for the 18-month-old child presenting with fever, nasal flaring, intercostal retractions, and a respiratory rate of 50 bpm is 'Ineffective breathing pattern.' These symptoms collectively indicate respiratory distress, which aligns with the nursing diagnosis of ineffective breathing pattern. Nasal flaring, intercostal retractions, and an increased respiratory rate are signs of respiratory distress in pediatric patients, suggesting the need for immediate intervention to address the underlying breathing difficulties.

Correct Answer: C

Rationale: Encouraging the child to drink liquids is essential in managing ketones in urine. Increased fluid intake can help prevent dehydration and aid in flushing out ketones, which is crucial in managing diabetic ketoacidosis, a serious complication of uncontrolled diabetes.

Correct Answer: C

Rationale: When managing a pediatric patient with asthma, the nurse needs to be vigilant about potential complications. While cor pulmonale, respiratory arrest, and respiratory failure are known complications of asthma, respiratory distress is not typically considered a direct complication. Respiratory distress is more of a symptom or a sign of worsening asthma, indicating the need for immediate intervention to prevent progression to more severe complications.