You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A 4-year-old boy whose diet consists mostly of cheese puffs and cola begins to have problems walking at night, complaining that he cannot see well. In addition, his skin has become dry and scaly, and he has complained of headache for a month. choose the one most appropriate vitamin or trace element replacement therapy to treat the described condition. and explain in detail?
Vitamin A deficiency manifests first in visual changes, including night blindness. Deficiency can also cause drying of the conjunctivas and sclera. Skin is frequently dry. Poor growth and impaired cognition are also seen.