Which condition is characterized by pallor and fatigue in children?

The condition characterized by pallor and fatigue in children is anemia. Anemia occurs when there is a deficiency of red blood cells or hemoglobin in the blood, which is essential for carrying oxygen to the body's tissues. As a result, children with anemia may appear pale due to inadequate blood flow or oxygenation to the skin. Fatigue is also a common symptom, as the body struggles to provide enough oxygen to the muscles and organs, leading to decreased energy levels and overall tiredness.

In the context of the other conditions, asthma primarily affects the respiratory system, leading to breathing difficulties rather than pallor and fatigue specifically. Dehydration can cause fatigue, but it is typically associated with other signs such as dry mouth, thirst, and decreased urination. Allergies can lead to symptoms like sneezing, itching, or rashes, but they do not typically present with pallor and fatigue. Thus, anemia is the condition most closely associated with the specific symptoms of pallor and fatigue in children.