**Core Concept**
EDTA (Ethylene diamine tetraacetic acid) is a chelating agent used in endodontics for its ability to dissolve calcium salts and remove smear layer, thereby enhancing the cleaning and shaping of root canals.

**Why the Correct Answer is Right**
EDTA works by forming stable complexes with metal ions, particularly calcium and magnesium, which are present in the dentin and cementum. This chelation process helps to remove the smear layer and open up the dentinal tubules, making it easier to clean and shape the root canal. The introduction of EDTA in endodontics marked a significant advancement in the field, allowing for more effective removal of debris and bacteria from the root canal system.

**Why Each Wrong Option is Incorrect**
**Option A:** EDTA was not introduced by this person, as there is no historical evidence to support this claim.
**Option B:** EDTA was not used in endodontics before its introduction, making this option incorrect.
**Option C:** EDTA's introduction was not solely due to this person's work, as it was a collaborative effort among many researchers and clinicians.

**Clinical Pearl / High-Yield Fact**
EDTA is commonly used in combination with sodium hypochlorite to enhance its chelating properties and improve the effectiveness of root canal cleaning and shaping.

**Correct Answer:** C. Ziskin