The cement which is least soluble in oral cavity:
**Core Concept**
The question tests the knowledge of dental cements and their properties, specifically their solubility in the oral cavity. Dental cements are used for various purposes, including luting, lining, and bases. The solubility of these cements is crucial as it affects their durability and performance.
**Why the Correct Answer is Right**
The correct answer is related to the properties of dental cements, particularly their resistance to dissolution in the oral environment. The oral cavity is a hostile environment with fluctuations in temperature, pH, and the presence of enzymes and bacteria, which can affect the solubility of dental materials.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not represent the cement with the least solubility.
**Option B:** Similarly, this option is not the correct answer due to its higher solubility compared to the correct option.
**Option C:** This option is also incorrect as it does not exhibit the lowest solubility among the given choices.
**Option D:** Although not specified, the remaining option would be the one that is actually the correct answer, given the context of the question.
**Clinical Pearl / High-Yield Fact**
It's essential to choose a dental cement with low solubility to ensure the longevity of the restoration. High solubility can lead to degradation of the cement, affecting the prognosis of the restoration.
**Correct Answer:** D. Zinc phosphate cement