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': 'The difference between gram + ye and gram -ye organism is that Gram +ve org. contains - \nSelect and explain. \nA. Teichoic acid, B. Muramic acid, C. N-acetyl neuraminic acid, D. Aromatic amino acids', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Teichoic acid Comparison of cell walls of Gram positive and Gram negative bacteria Gram positive Gram negative Thickness Thicker Thinner Variety of aminoacids Few Several Aromatic and sulphur containing aminoacids Absent Present Lipids Absent or scanty Present Teichoic acid Present Absent", 'role': 'assistant'}]