**Core Concept:** Gas gangrene is a severe bacterial infection characterized by the production of gas in tissues. It is caused by Clostridium perfringens, a type of anaerobic gram-positive bacterium. The infection results in necrosis of the affected tissue and can rapidly progress to systemic infection and sepsis if not treated promptly.

**Why the Correct Answer is Right:** The correct answer, **D**, refers to the administration of antibiotics and surgical intervention. Gas gangrene is an acute, life-threatening infection caused by Clostridium perfringens. Antibiotics such as clindamycin and metronidazole are effective against this organism. Additionally, surgical debridement is essential to remove necrotic tissue and prevent the spread of infection.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect pharmacotherapy**: Option A suggests the use of penicillin, which is not effective against Clostridium perfringens due to its anaerobic nature. Penicillin is active against aerobic bacteria but does not target anaerobes like Clostridium perfringens.

B. **Incorrect surgical intervention**: Option B suggests the use of wound dressings and elevation, which are supportive measures rather than the primary treatment for gas gangrene. The mainstay of treatment remains antibiotics and surgical debridement.

C. **Incorrect pharmacotherapy and surgical intervention**: Option C suggests the use of wound dressings and elevation, which are supportive measures rather than the primary treatment for gas gangrene. Additionally, penicillin is ineffective against Clostridium perfringens, as mentioned above.

**Clinical Pearls**:

1. **Timely intervention**: Gas gangrene is a life-threatening condition, and prompt recognition and treatment are crucial to prevent sepsis and systemic complications.
2. **Surgical debridement**: In addition to antibiotics, surgical debridement removes necrotic tissue, preventing the spread of infection and promoting tissue healing.
3. **Specific antibiotics**: Clindamycin and metronidazole are the preferred antibiotics in treating gas gangrene due to their effectiveness against Clostridium perfringens, an anaerobic bacterium.