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
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 sho chains. Direct wet from the culture shows tumbling motility. The most likely organism is - 
Select and explain. 
A. Listera monocytogenes, B. Corynebacterium sp, C. Enterococcus sp., D. Erysipelothrix rhusiopathiae
A: Listera monocytogenes
Answer: A: Listera monocytogenes 
Explanation: . Ans. is 'a' i.e., Listera monocytogenes . The impoant clues in this question are . Organisms are gram positive coccobacilli . Organisms are pleomorphic and occuring in sho chains. . There is tumbling motility. . All these are the features of Listeria monocytogens. . Corynebacteria are gram positive bacilli (not coccobacilli) and are nonmotile. . Enterococci (group ' d' streptococci) are gram positive cocci (not coccobacilli) and are non motile.