**Core Concept**
Linear deposits of immunoglobulin on immunofluorescence microscopy are characteristic of a specific type of autoimmune disease that affects the kidneys. This phenomenon is a hallmark of immune complex deposition in the glomerular basement membrane.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of immune complex deposition in the kidneys. In this condition, circulating immune complexes containing immunoglobulins (antibodies) and antigens deposit in the glomerular basement membrane, leading to activation of the complement system and subsequent inflammation. This results in the characteristic linear pattern of immunoglobulin deposition seen on immunofluorescence microscopy.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not describe a condition characterized by linear deposits of immunoglobulin on immunofluorescence microscopy. Instead, it might refer to a condition with granular deposits.
* **Option B:** This option is incorrect because it describes a different type of immune-mediated disease that does not typically feature linear deposits of immunoglobulin on immunofluorescence microscopy.
* **Option C:** This option is incorrect because it does not accurately describe the characteristic pattern of immunoglobulin deposition in the condition being tested.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that linear deposits of immunoglobulin on immunofluorescence microscopy are a hallmark of Goodpasture's syndrome, a rare autoimmune disease that affects the kidneys and lungs.

**Correct Answer: D. Goodpasture's syndrome**