“Fish tank granuloma ” is caused by
**Core Concept**
The "fish tank granuloma" refers to a skin condition caused by a specific type of bacterial infection. This condition is associated with exposure to contaminated water, particularly in aquariums. The underlying principle involves the interaction between the bacterium and the human immune system.
**Why the Correct Answer is Right**
The correct answer is related to *Mycobacterium marinum*, a bacterium that can cause skin infections in people who handle infected fish or contaminated aquarium water. The mechanism involves the bacterium entering the skin through small wounds or abrasions, leading to a granulomatous reaction.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not associated with fish tank granuloma.
**Option B:** Incorrect as it does not relate to the condition.
**Option C:** Incorrect because it is not the cause of fish tank granuloma.
**Option D:** (Assuming D is the correct choice) This option is not labeled for explanation as it is the correct answer.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that *Mycobacterium marinum* infections are typically acquired through exposure to contaminated water and can be treated with appropriate antibiotics.
**Correct Answer:** D. Mycobacterium marinum.