Malignant pustule is caused by:
**Core Concept**
Malignant pustule is a type of skin lesion caused by cutaneous anthrax, a bacterial infection. It is characterized by a painless, ulcerative lesion that often develops from an initial papule or vesicle.
**Why the Correct Answer is Right**
The correct answer is caused by the bacterium *Bacillus anthracis*, which produces a toxin that leads to the characteristic skin lesion. The toxin works by inhibiting the production of inflammatory mediators and causing tissue necrosis. The bacteria enter the body through a cut or scratch, and the toxin is released locally, causing the characteristic symptoms of malignant pustule.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not the causative agent of malignant pustule.
**Option B:** This option is incorrect because it is not a known cause of cutaneous anthrax.
**Option C:** This option is incorrect because it is not the primary cause of malignant pustule.
**Clinical Pearl / High-Yield Fact**
Malignant pustule is a classic example of a skin lesion that can be prevented by proper hygiene and wound care. It is essential to recognize the characteristic symptoms and seek medical attention promptly to prevent further complications.
**Correct Answer:** D. Bacillus anthracis