**Core Concept**
Pneumothorax due to blunt injury involves the accumulation of air in the pleural space, leading to lung collapse. The treatment of choice aims to re-expand the lung and prevent further complications.

**Why the Correct Answer is Right**
The treatment of choice for pneumothorax due to blunt injury is needle aspiration or insertion of a chest tube to allow air to escape and lung re-expansion. This is typically done in a controlled environment like the emergency department. The procedure may involve the insertion of a large-bore cannula or a chest tube connected to a drainage system to facilitate air removal and re-expansion of the lung. The goal is to restore normal lung function and prevent further complications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not specified, but it might be a medication or a procedure that is not the primary treatment for pneumothorax due to blunt injury.
**Option B:** Chest X-ray is a diagnostic tool used to confirm the presence of pneumothorax, but it is not the treatment of choice.
**Option C:** This option might refer to a surgical procedure, but the treatment of choice for pneumothorax due to blunt injury is typically less invasive.

**Clinical Pearl / High-Yield Fact**
In cases of tension pneumothorax, immediate decompression is required to prevent cardiac arrest and death. This can be done by inserting a large-bore needle into the second intercostal space in the mid-clavicular line.

**Correct Answer: C. Chest tube insertion.