This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Which of the follow ing is gram positive bacillus- 
Select and explain. 
A. Staphylococcus, B. Streptococcus, C. Listeria, D. Meningococci
C: Listeria
Answer: C: Listeria 
Explanation: Ans. is 'c' i.e., Listeria Gram positive bacteriao There are 6 classic gram positive bacteria that cause human disease,o Of these 2 are cocci1. Staphylococci2 Streptococci (including anaerobic peptostreptococci)o Other 4 are bacilli1. Corynebacterium3. Clostridium2 Bacillus4. Listeria