**Core Concept**
The question pertains to the composition of non-zinc containing dental amalgam alloys, focusing on the presence of zinc. Dental amalgam is a mixture of mercury with alloy particles, typically containing silver, tin, copper, and other metals.

**Why the Correct Answer is Right**
In non-zinc containing dental amalgam, the emphasis is on the absence or minimal presence of zinc, which is sometimes added to improve handling properties but is not a primary component. The correct answer reflects this minimal or specified amount of zinc.

**Why Each Wrong Option is Incorrect**
**Option A:** This would imply a significant amount of zinc, contradicting the "non-zinc containing" designation.
**Option B:** Similarly, this suggests a notable presence of zinc, which does not align with the alloy type in question.
**Option C:** This option also implies a higher zinc content than expected for a non-zinc containing alloy.
**Option D:** This is the correct answer as it aligns with the expected minimal or zero zinc content in non-zinc containing dental amalgam alloys.

**Clinical Pearl / High-Yield Fact**
It's crucial to understand the composition of dental materials, as each component can affect the properties and biocompatibility of the final product.

**Correct Answer:** D. 0%