This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Which of the following is not true about the cell wall of Gram positive bacteria? \nSelect and explain. \nA. Thicker, B. Several varieties of amino acids, C. Absence of lipids, D. Absence of sulphur containing amino acids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]