An 18-year-old college freshman reports to the campus health clinic. He states that he has felt very fatigued and generally ill for about a week and developed sore throat, fever, and headache the day before. He has been sleeping more than usual and has virtually no appetite. He says his girlfriend, who attends college in a different state and whom he saw last month, has also been feeling very fatigued for the last two weeks or so, but she displays none of the student’s other symptoms. Which disease and causative agent pair would be responsible for these symptoms?1. Lyme disease caused by Borrelia burgdorferi2. malaria caused by Plasmodium falciparum3. infectious mononucleosis caused by the Epstein-Barr virus (EBV)4. ehrlichiosis caused by Ehrlichia chaffeensis

The correct answer is option 3.

Explanation:

The person would have been suffering from a chronic fatigue syndrome resulting due to infectious mononucleosis by the Epstein-Barr virus. An array of diseases in human beings originates due to an infection caused by the Epstein-Barr virus, of which the infectious mononucleosis is the most common one.  

The condition arises due to the primary infection caused by the virus. It is an acute illness, which is featured by the symptoms of fever, sore throat, pain and jaundice. Infectious mononucleosis is most commonly found in teenagers. The spreading of the virus usually takes place via saliva, due to which it is also known as kissing disease.  

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.