The causes of need for emergency care can be divided into two main categories: Heart attack and signs of severe disease or illness that is option 'A'
Heart attack is the result of the obstruction of coronary artery. Thrombus (blood clot) block that lodges in an area of coronary artery thickened with cholesterol containing plaque due to atherosclerosis.
Hypertension, increased cholesterol, and other smoking disease are some factors of the heart attack. Heart attack and other severe disease and illness like seizures, sudden breath problem, kidney disease need medical emergency care.
Chewing and taking aspirin is an important part of emergency care of the heart attack. There are specific drugs provided for heart attack which should be given in time. Another diseases like seizures and kidney infection need emergency medical attention as they are also life-threatening diseases.
Hence, the correct option is 'A'
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