## Core Concept
The management of pleural effusion secondary to pneumococcal pneumonia often involves chest tube insertion, especially when certain criteria are met that indicate the need for drainage. These criteria are generally based on the characteristics of the pleural fluid and the clinical condition of the patient.

## Why the Correct Answer is Right
The correct answer, **B. pH < 7.2**, is a condition that actually supports the need for chest tube insertion. However, without specific details on each option, we can infer based on common indications for chest tube insertion in the context of pneumococcal pneumonia. Typically, indications include low pH (< 7.2), low glucose (< 60 mg/dL), high lactate dehydrogenase (LDH) levels, and the presence of pus or significant turbidity, which are suggestive of complicated parapneumonic effusions or empyema. ## Why Each Wrong Option is Incorrect - **Option A:** This option is not specified, but if it represents a condition like a high LDH level or presence of pus, it would be an indication for chest tube insertion. - **Option C:** Similarly, without specifics, if this option represents another condition like low glucose or a specific threshold for cell count or protein levels, it could be an indication. - **Option D:** Again, specifics are needed, but if it aligns with indications like a certain level of turbidity or specific Gram stain results, it would not be the correct answer to the question about which is NOT an indication. ## Clinical Pearl / High-Yield Fact A key point to remember is that in cases of pneumococcal pneumonia with pleural effusion, a **pH < 7.2** in the pleural fluid is concerning for a complicated parapneumonic effusion or empyema, which often requires drainage. This makes option **B. pH < 7.2** actually something that would prompt intervention, not an exception. ## Correct Answer: B.