Final answer:
Oral thrush is a fungal infection caused by an overgrowth of Candida yeast in the mouth. It appears as white patches in the oral cavity. Treatment options include topical and systemic antifungal medications.
Step-by-step explanation:
Oral thrush is a fungal infection caused by an overgrowth of Candida yeast in the oral cavity. It is characterized by the appearance of white patches and pseudomembranes in the mouth. It is most common in infants, immunodeficient patients, and patients with AIDS. Treatment options include topical antifungal medications like nystatin or clotrimazole, and in severe cases, systemic antifungal medications like fluconazole or itraconazole.