医学考研英语新东方答案解析如下：
1. 问题：The patient is experiencing a sharp, stabbing pain in the chest. What could be the cause?
答案：The sharp, stabbing pain in the chest could be indicative of a heart attack or pulmonary embolism.
2. 问题：Which medication is used to treat a patient with hyperthyroidism?
答案：The patient with hyperthyroidism can be treated with medications such as methimazole or propylthiouracil.
3. 问题：What is the main function of the kidneys?
答案：The main function of the kidneys is to filter waste products from the blood and maintain fluid and electrolyte balance.
4. 问题：Which of the following is a symptom of appendicitis?
答案：One of the symptoms of appendicitis is a dull, constant pain in the lower right quadrant of the abdomen.
5. 问题：What is the most common cause of chronic kidney disease?
答案：The most common cause of chronic kidney disease is diabetes mellitus.
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