question: Q:A 22-year-old woman at 30 weeks gestation presents to the obstetrician with the sudden onset of fever, headache, anorexia, fatigue, and malaise. She mentioned that she had eaten ice cream 3 days ago. Blood cultures show gram-positive rods that are catalase-positive and display distinctive tumbling motility in liquid medium. What is the most likely diagnosis?? 
  {'A': 'Brucellosis', 'B': 'Influenza', 'C': 'Listeriosis', 'D': "Legionnaires' disease", 'E': 'Tularaemia'},