**Core Concept**
Hanup's disease, also known as Hartnup disease, is a rare genetic disorder affecting the body's ability to absorb certain amino acids from the diet. It is caused by mutations in the SLC6A19 gene, leading to impaired transport of neutral amino acids in the kidneys and intestines.

**Why the Correct Answer is Right**
Hanup's disease is characterized by symptoms such as pellagra, a condition caused by niacin deficiency, due to the impaired absorption of tryptophan, an amino acid that is converted to niacin in the body. The disease also leads to increased urinary excretion of neutral amino acids, including histidine, leucine, and phenylalanine. Additionally, patients with Hanup's disease may exhibit neurological symptoms, such as ataxia and tremors.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but if it were a feature of Hanup's disease, it would be incorrect. Hanup's disease is not typically associated with features such as kidney stones or hemolytic anemia.
**Option B:** Not a feature of Hanup's disease, but it is not explicitly listed here. If it were, it would be incorrect. However, since it is not listed, we will move forward.
**Option C:** This option is not provided, but if it were a feature of Hanup's disease, it would be incorrect. Hanup's disease is not typically associated with features such as thyroid dysfunction or adrenal insufficiency.
**Option D:** Not a feature of Hanup's disease, but it is not explicitly listed here. If it were, it would be incorrect. However, since it is not listed, we will move forward.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that Hanup's disease is a rare genetic disorder that affects the body's ability to absorb certain amino acids, leading to symptoms such as pellagra and neurological issues. A key feature of the disease is the impaired transport of neutral amino acids in the kidneys and intestines.

**Correct Answer: D.**