**Core Concept**
The detection of glucose involves various biochemical methods that utilize specific enzymes or chemical reactions to measure glucose concentration. These methods are crucial in clinical settings for diagnosing and managing diabetes mellitus.

**Why the Correct Answer is Right**
The Ferric Chloride test (Option B) is not used for glucose detection. This test is actually used to detect the presence of phenol or other phenolic compounds in a sample. Glucose does not react with Ferric Chloride to produce a color change, which is the typical outcome of this test. In contrast, glucose detection methods like glucose oxidase (Option A), Dextrostix (Option C), and the Follin and Wu method (Option D) utilize different mechanisms to measure glucose concentration. Glucose oxidase, for instance, catalyzes the oxidation of glucose to gluconic acid and hydrogen peroxide, which can then be measured.

**Why Each Wrong Option is Incorrect**
**Option A:** Glucose oxidase is a common enzyme used in glucose detection assays, such as the glucose oxidase-peroxidase (GOD-POD) method.
**Option C:** Dextrostix is a type of glucose test strip that contains glucose oxidase and uses a colorimetric reaction to measure glucose concentration.
**Option D:** The Follin and Wu method is a colorimetric assay used to measure glucose concentration in blood samples.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that different glucose detection methods have varying levels of accuracy and sensitivity. The choice of method depends on the specific clinical context and the type of sample being analyzed.

**✓ Correct Answer: B. Ferric Chloride test**