## **Core Concept**
The specific plaque hypothesis is a concept in periodontology that suggests certain specific types of bacteria or microbial complexes are associated with periodontal disease. This hypothesis contrasts with the earlier "non-specific plaque hypothesis," which proposed that periodontal disease was caused by a nonspecific accumulation of plaque bacteria.

## **Why the Correct Answer is Right**
The specific plaque hypothesis was proposed by **Mandel and Lehner** in 1970, but it gained significant support and further development from the work of **Socransky and Haffajee**. They identified specific microbial complexes in subgingival plaque that correlate with periodontal health and disease. These researchers used advanced microbiological techniques to classify bacteria into different complexes based on their presence in healthy or diseased sites.

## **Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because, although there are many contributors to the field of periodontology, the specific names associated with the development of the specific plaque hypothesis are key.
* **Option B:** This option is incorrect as it does not directly correspond with the known primary proponents of the specific plaque hypothesis.
* **Option D:** This option is incorrect because, similar to option B, it does not align with the historically recognized contributors to this hypothesis.

## **Clinical Pearl / High-Yield Fact**
A critical point to remember is that the specific plaque hypothesis underpins the current understanding and treatment approaches for periodontal diseases, emphasizing the importance of identifying and controlling specific pathogens. This concept is crucial for dental professionals, especially when planning treatment strategies for periodontal disease.

## **Correct Answer:** C. Socransky and Haffajee.