The most appropriate treatment for burning mouth syndrome (BMS) — a condition with burning/raw tongue sensation with no identifiable cause — is:

Correct answer: D. Topical or systemic clonazepam

• A. Pilocarpine stimulates salivary glands for xerostomia; BMS is not primarily caused by dry mouth.
• B. Fluconazole treats candidiasis; BMS is a diagnosis of exclusion after ruling out candida — antifungals would be used only if candidiasis is confirmed.
• C. Chlorhexidine treats bacterial/candidal infections; BMS has no infectious etiology and would not respond to chlorhexidine.
• D. Correct. Burning mouth syndrome (BMS) is a diagnosis of exclusion with unknown etiology. After ruling out candidiasis, xerostomia, nutritional deficiencies, and contact allergies, a common evidence-based pharmacological treatment is topical or systemic clonazepam (a benzodiazepine), which reduces pain intensity through its GABAergic mechanism.