This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'A 30 year old woman with a bad obstetric history presents with fever. The blood culture from the patient grows gram-positive small to medium coccobacilli that are pleomorphic, occurring in short chains. Direct wet from the culture shows tumbling motility. The most likely organism is - \nSelect and explain. \nA. Listera monocytogenes, B. Corynebacterium sp., C. Enterococcus sp., D. Erysipelothrix rhusiopathiae', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Listeria in pregnancy can lead to abortion.\nFebrile woman with a bad obstetric history presents with gram-positive coccobacilli and tumbling motility is suggestive\xa0of Listeria monocytogenes.', 'role': 'assistant'}]