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 & 1/2 year old girl always had to wear warm socks even in summer season. On physical examination, it was noticed that she had high blood pressure and her femoral pulse was weak as compared to radial and carotid pulse, a chest radiography showed remarkable notching of ribs along with their lower borders. This was due to – and explain in detail?
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