**Core Concept**
Clostridia are a group of Gram-positive, anaerobic bacteria that can be classified based on their metabolic properties as either saccharolytic or proteolytic. Saccharolytic Clostridia are those that utilize carbohydrates as their primary source of energy, while proteolytic Clostridia break down proteins for energy.

**Why the Correct Answer is Right**
Sporogenes is a proteolytic Clostridium species, meaning it obtains its energy by breaking down proteins rather than carbohydrates. This is in contrast to the other options, which are all saccharolytic. For example, Clostridium welchii (also known as Clostridium perfringens) is a saccharolytic species that uses glucose and other carbohydrates for energy. Similarly, Clostridium septicum and Clostridium oedematiens are also saccharolytic.

**Why Each Wrong Option is Incorrect**
**Option A:** Clostridium welchii is a saccharolytic species that is commonly associated with gas gangrene and food poisoning. It uses carbohydrates such as glucose for energy.
**Option C:** Clostridium septicum is a saccharolytic species that can cause gangrene and gas gangrene. It also utilizes carbohydrates for energy.
**Option D:** Clostridium oedematiens, also known as Clostridium novyi, is a saccharolytic species that can cause gas gangrene and other diseases. It breaks down carbohydrates for energy.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Clostridium species can be classified based on their metabolic properties, with saccharolytic species using carbohydrates for energy and proteolytic species breaking down proteins. This classification is crucial for understanding the pathophysiology of diseases caused by these bacteria.

**✓ Correct Answer: B. Sporogenes. Clostridium Sporogenes is a proteolytic species.**