Final answer:
Cheilosis is a symptom of ariboflavinosis characterized by sores on the outside and corners of the lips, which is the answer 'c' to the student's question.
Step-by-step explanation:
Cheilosis, a symptom of ariboflavinosis, is characterized by sores on the outside and corners of the lips. Therefore, the correct answer to the student's question is c. sores on the outside and corners of the lips. Ariboflavinosis is a deficiency disease caused by a lack of vitamin B2 (riboflavin) and can lead to a range of symptoms including characteristic lesions of the lips, cheilosis, dermatitis, and a magenta tongue.
The severity of these symptoms can vary, but without proper treatment, the condition can lead to more severe health issues. Riboflavin plays a crucial role in energy production and cellular function, and its absence can thus impact various systems within the body. It is important to ensure adequate intake of this essential vitamin through a balanced diet or supplementation as recommended by a healthcare professional.