**Core Concept**
The Maltese cross is a characteristic birefringent pattern seen under polarizing microscopy, typically associated with the crystallization of certain substances, including cholesterol crystals in the setting of acute gouty arthritis or atheromatous plaques in vascular disease.

**Why the Correct Answer is Right**
The Maltese cross is formed due to the birefringent properties of cholesterol crystals, which appear as a cross-like pattern when viewed under polarized light. This is because the cholesterol molecules are arranged in a specific crystalline structure that exhibits optical anisotropy, allowing them to rotate the plane of polarized light. In the context of acute gouty arthritis, the presence of a Maltese cross under polarizing microscopy can be a diagnostic clue, as it suggests the presence of monosodium urate crystals in the joint fluid.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the Maltese cross is not typically associated with the crystallization of glucose or other sugars.
* **Option B:** This option is incorrect because the Maltese cross is not a characteristic feature of calcium pyrophosphate dihydrate (CPPD) crystals, which are associated with pseudogout.
* **Option C:** This option is incorrect because the Maltese cross is not typically seen in the setting of septic arthritis, where the joint fluid typically shows a more chaotic or disorganized appearance under polarizing microscopy.

**Clinical Pearl / High-Yield Fact**
The presence of a Maltese cross under polarizing microscopy can be a diagnostic clue for acute gouty arthritis, particularly when combined with clinical findings such as joint pain, swelling, and erythema.

**Correct Answer: A. Cholesterol crystals.**