Which symptom is listed as a dehydration sign?

• A. Fever
• B. Cough
• C. Rash
• D. Thirst

Answer: (D)

Thirst is a direct signal that the body needs fluids, so it is the most reliable sign of dehydration among the options. When you’re dehydrated, the brain detects fluid loss and triggers the urge to drink to restore balance. Fever, cough, and rash point to infections or inflammation rather than fluid loss, so they don’t specifically indicate dehydration. Keep in mind that thirst can be less reliable in very young children or older adults, so other indicators like dry mouth, reduced urine output, or dark urine can help assess hydration as dehydration becomes more likely.