**Core Concept**
Thrush, also known as oral candidiasis, is a fungal infection caused by Candida species, particularly Candida albicans. It affects the mucous membranes of the mouth, leading to white patches and discomfort.

**Why the Correct Answer is Right**
The correct answer will be the statement that is not true about thrush. Thrush is characterized by the presence of pseudohyphae and blastoconidia on a 10% potassium hydroxide (KOH) wet mount. It is a common opportunistic infection in immunocompromised individuals, such as those with diabetes, HIV/AIDS, or taking broad-spectrum antibiotics. Candida albicans adheres to the mucosal surface through adhesins and forms biofilms, which contribute to its pathogenicity.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because thrush is indeed more common in immunocompromised individuals, such as those with diabetes, HIV/AIDS, or taking broad-spectrum antibiotics.
**Option B:** This option is incorrect because Candida albicans is the most common species causing oral candidiasis, also known as thrush.
**Option C:** This option is incorrect because pseudohyphae and blastoconidia are characteristic features of Candida species, particularly C. albicans, on a KOH wet mount.

**Clinical Pearl / High-Yield Fact**
Thrush can be prevented by maintaining good oral hygiene, reducing sugar intake, and avoiding broad-spectrum antibiotics. It is essential to recognize thrush in immunocompromised patients, as it can be a marker of underlying disease.

**Correct Answer:** A