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': 'Which of the following cell surface markers are associated with T helper cells? \nSelect and explain. \nA. CD2- CD3- CD4- CD8- TCR- cell, B. CD2+ CD3+ CD4- CD8- TCR+ cell, C. CD2+ CD3+ CD4+ CD8- TCR+ cell, D. CD2+ CD3+ CD4- CD8+ TCR+ cell', 'role': 'user'}, {'content': 'Answer: C \nExplanation: T cells are mainly divided into: 1. T helper cells 2. Cytotoxic T cells T helper cells are also called CD4+ T cells Cytotoxic T cells are also called CD8+ T cells T helper cells have all of the listed markers except for CD8 while cytotoxic T cells have all of the listed markers except for CD4 CD2, CD3 and TCR will be present on all mature T cells', 'role': 'assistant'}]