Correct Answer: C

Rationale: Inability to lie supine is a specific sign of lower respiratory infection. This condition can cause discomfort or difficulty in breathing when lying flat, leading to a preference for an upright or semi-upright position. While cough and fever are common symptoms of respiratory infections, the inability to lie supine is more indicative of lower respiratory involvement.

Correct Answer: C

Rationale: Inability to lie supine is a significant indication of lower respiratory infection. This symptom often occurs due to breathing difficulties and discomfort experienced by individuals with lower respiratory infections, such as pneumonia or bronchitis. It can be caused by lung inflammation, consolidation, or fluid buildup in the lungs, making lying flat uncomfortable or difficult. Monitoring a patient's ability to lie flat can provide valuable information about the severity and progression of a lower respiratory infection.

Correct Answer: D

Rationale: The statement 'We need to maintain droplet precautions and a quiet environment for at least 2 weeks' indicates a need for further instruction. Asthma management does not typically require maintaining droplet precautions. The focus should be on environmental control, medication adherence, and monitoring symptoms rather than droplet precautions, which are more relevant for contagious respiratory infections.

Correct Answer: B

Rationale: In the management of diabetic ketoacidosis (DKA), the initial intravenous (IV) fluid of choice is normal saline infusion. Normal saline helps to correct dehydration and electrolyte imbalances commonly seen in DKA patients. It does not contain glucose to prevent worsening hyperglycemia or ketoacidosis. NPH insulin infusion is not the initial treatment for DKA; it is typically used after fluid resuscitation. Potassium infusion may be required in DKA to address electrolyte imbalances, but normal saline is the priority for fluid resuscitation.

Correct Answer: A

Rationale: For a 7-month-old baby with diarrhea and signs of moderate dehydration who can still drink, the most appropriate fluid is Oral Rehydration Solution (ORS). ORS helps in rehydrating the body and replenishing lost electrolytes, making it essential in managing dehydration due to diarrhea.