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
Staphylococcus is - 
Select and explain. 
A. Gram - positive cocci, B. Gram - negative cocci, C. Gram - positive bacillus, D. Gram - negative bacillus
A: Gram - positive cocci
Answer: A: Gram - positive cocci 
Explanation: Ans. is 'a' i.e., Gram - positive cocci Gram positive bacteria . There are 6 classic grain positive bacteria that cause human disease. . Of these 2 are cocci Staphylococci Streptococci (including anaerobic peptostreptococci) . Other 4 are bacilli Corynebacterium 3. Clostridium Bacillus 4. Listeria