Which of the following conditions is correctly paired with its causative organism?

Athlete's foot is a fungal infection caused by various types of fungi, primarily dermatophytes. These fungi thrive in warm, moist environments, such as the spaces between toes, leading to symptoms such as itching, burning, and peeling skin. This pairing accurately reflects the causative organism associated with the condition.

In contrast, the flu is caused by a virus, not just any organism; the common cold is primarily caused by viral infections, and the stomach flu tends to be associated with viruses or, in some minor cases, certain parasites, but not specifically one type. Therefore, identifying Athlete's foot with its fungal origin highlights the specific nature of the pathogens responsible for these types of infections in health and physical education contexts.