## Core Concept
Behçet's syndrome is a form of vasculitis that can affect multiple parts of the body. It is characterized by a classic triad of recurrent oral ulcers, genital ulcers, and uveitis. The condition involves inflammation of blood vessels throughout the body and can lead to various symptoms depending on the organs affected.

## Why the Correct Answer is Right
Option is related to the manifestations commonly seen in Behçet's syndrome. The condition is known for causing oral ulcers, genital ulcers, skin lesions, and ocular involvement, among other symptoms.

## Why Each Wrong Option is Incorrect
* **Option A:** Oral ulcers are a hallmark of Behçet's syndrome. Almost all patients experience recurrent oral ulcers, which are often the first symptom to appear.
* **Option B:** Genital ulcers are another common feature, similar to oral ulcers but occurring in the genital area.
* **Option C:** Ocular involvement, including uveitis, is a serious complication that can lead to blindness if not properly treated.
* **Option D:** While gastrointestinal symptoms and arthritis can occur, they are not as universally recognized or specific to Behçet's syndrome as the other options. However, given the context, we need to identify which one is least associated.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that Behçet's syndrome can be diagnosed based on the presence of recurrent oral ulcers plus any one of the following: recurrent genital ulcers, uveitis, or skin lesions. This syndrome is more common along the Silk Road, from Turkey to China.

## Correct Answer: D.