question: Q:A 4-year-old boy is brought to the emergency department for evaluation of a fever for 1 day. The mother reports that he has had severe pain in his lower extremities and difficulty eating since yesterday. He has not had a cough, nausea, or vomiting. He was born at term and has been healthy. His immunizations are up-to-date. He appears irritable. His temperature is 38.5°C (101.3°F). Examination shows several flesh-colored, tender papules over the trunk, knees, palms, and soles. There are multiple 2-mm, reddish macules on the hard palate. The remainder of the examination shows no abnormalities. Which of the following is the most likely causal organism of this patient's symptoms?? 
  {'A': 'Human herpesvirus 6', 'B': 'Rubella virus', 'C': 'Herpes simplex virus 1', 'D': 'Coxsackie A virus', 'E': 'Measles virus'},