Sulphur granules are composed of
**Core Concept**
Sulphur granules are a characteristic feature of Actinobacillus actinomycetemcomitans, a bacterium associated with periodontal disease. These granules are formed due to the accumulation of sulphur-containing compounds, which are a result of the bacterial metabolism.
**Why the Correct Answer is Right**
The formation of sulphur granules is a defence mechanism employed by the bacteria to protect themselves from environmental stressors. The bacteria accumulate sulphur-containing compounds, such as hydrogen sulphide and elemental sulphur, which are toxic to other microorganisms. This allows the bacteria to outcompete other microorganisms in the oral cavity and establish a strong foothold in the periodontal pocket.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the composition of sulphur granules.
**Option B:** This option is incorrect as it does not correctly identify the bacterium associated with sulphur granules.
**Option C:** This option is incorrect as it does not accurately describe the function of sulphur granules.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize the presence of sulphur granules in periodontal disease, as it can aid in the diagnosis and treatment of the condition. The presence of these granules can also indicate a more aggressive form of periodontal disease.
**Correct Answer:** D.