**Core Concept**
G6 phosphatase deficiency is a rare genetic disorder characterized by an inability to convert glucose-6-phosphate into glucose in the liver, leading to a buildup of glucose-6-phosphate and subsequent accumulation of glycogen. This deficiency disrupts the normal hepatic glucose metabolism, resulting in an inability to maintain normal blood glucose levels.

**Why the Correct Answer is Right**
The correct answer is associated with von Gierke's disease, a type of glycogen storage disorder. In von Gierke's disease, the G6 phosphatase enzyme is deficient or absent, leading to the accumulation of glycogen in the liver. The enzyme G6 phosphatase is crucial for the final step of glycogenolysis, where glucose-6-phosphate is converted into glucose. The absence of this enzyme impairs the breakdown of glycogen, resulting in hypoglycemia and lactic acidemia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not correspond to a recognized genetic disorder associated with G6 phosphatase deficiency.
**Option B:** This option is incorrect as it is associated with a different enzyme deficiency, not G6 phosphatase.
**Option C:** This option is incorrect as it is a different type of glycogen storage disorder, not related to G6 phosphatase deficiency.

**Clinical Pearl / High-Yield Fact**
Von Gierke's disease is an autosomal recessive disorder, meaning that affected individuals inherit two defective copies of the G6 phosphatase gene, one from each parent.

**Correct Answer: B. Von Gierke's disease.**