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
[{'content': 'Periplasmic space is seen in - \nSelect and explain. \nA. Gram positive bacteria, B. Gram negative bacteria, C. Acid fast bacteria, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Gram negative bacteria * Periplasmic space is a narrow space between cytoplasmic membrane (plasma membrane) and cell wall.* Periplasmic space has been more frequently and better recorded in gram-negative bacteria as compared to gram- negative."At present most gram positive bacteria are thought to have only periplasm, but not periplasmic space".', 'role': 'assistant'}]