## Core Concept
Levamisole is an anthelmintic and immunomodulatory drug. It is primarily used to treat worm infections and sometimes for its immunostimulant properties. The drug works by enhancing the host's immune response.

## Why the Correct Answer is Right
Levamisole's mechanism of action as an immunomodulator involves enhancing T-cell function and stimulating the production of antibodies. However, detailed information about the specific options provided is needed to explain why one of them is incorrect regarding levamisole.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specific details on option A, let's hypothetically say if it stated a correct use or mechanism of levamisole, it wouldn't be the incorrect statement we're looking for.
- **Option B:** Similarly, if option B presented a known effect or application of levamisole, it would not be the answer.
- **Option C:** This option might discuss an off-label or experimental use of levamisole.
- **Option D:** Given that the correct answer is associated with option D, let's assume it mentions something not attributed to levamisole, such as a primary use for treating viral infections directly, which is not accurate.

## Clinical Pearl / High-Yield Fact
A notable use of levamisole is in the treatment of ascariasis (roundworm infection). It is also worth noting for its use in veterinary medicine to treat worm infections in animals.

## Correct Answer Line
Given the lack of specific details on each option but knowing **D** is correct based on the question prompt: **Correct Answer: D.**