Which of the following are signs of dehydration?

Dehydration occurs when the body loses more fluids than it takes in, leading to a deficiency that can affect various systems in the body. Signs of dehydration can vary, but certain symptoms are commonly recognized as indicators of this condition.

Dry mouth indicates a lack of adequate moisture in the oral cavity, which is a direct symptom of dehydration. Fatigue is also prevalent, as it reflects the body's reduced energy due to insufficient hydration, impacting physical performance and cognitive function. Together, these two signs highlight the body's need for fluids, making option B a strong representation of dehydration symptoms.

Bright urine and nausea, while they may indicate hydration levels to some extent, do not consistently relate to dehydration. Bright urine often suggests concentrated urine but can also occur without dehydration, while nausea might stem from various causes. Similarly, excess sweating and chills are more indicative of overheating or illness rather than dehydration alone. Frequent urination can actually signal adequate hydration or the presence of certain medical conditions, and headaches can have numerous causes not exclusively linked to dehydration.

Thus, dry mouth and fatigue serve as clear signs of dehydration, emphasizing the importance of recognizing these symptoms in identifying the need for fluid replacement.