**Core Concept**
The concept being tested here is the criteria for hospitalization in pneumonia, particularly in children. The correct answer is related to the threshold temperature at which hospitalization is not typically recommended.

**Why the Correct Answer is Right**
Fever of 39°C is not an absolute indication for hospitalization in pneumonia, especially in otherwise healthy children. The decision to admit a child with pneumonia is based on a combination of factors, including the presence of severe symptoms, underlying medical conditions, and the child's overall clinical condition. A temperature of 39°C, while concerning, is often managed in an outpatient setting with close follow-up.

**Why Each Wrong Option is Incorrect**
**Option B:** Cyanosis, or a bluish discoloration of the skin, is a sign of severe respiratory distress and is a clear indication for hospitalization in pneumonia.
**Option C:** Chest retraction, or the inward movement of the chest wall during breathing, is a sign of respiratory distress and indicates the need for hospitalization in pneumonia.
**Option D:** Not feeding well is a common symptom in children with pneumonia and is often an indication for hospitalization to ensure adequate nutrition and hydration.

**Clinical Pearl / High-Yield Fact**
In children with pneumonia, the decision to hospitalize is often based on the presence of certain " danger signs," which include difficulty breathing, chest retraction, cyanosis, and lethargy. These signs indicate a need for closer monitoring and treatment.

**✓ Correct Answer: A. Fever of 390 c**