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: Forensic Medicine
[{'content': 'ABO antigen are found in all except ? \nSelect and explain. \nA. Saliva, B. Sweat, C. CSF, D. Gastric juice', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., CSF ABO antigen can be demenstrated in all body fluids except CSF"_________ Reddy. They are detected in almost all tissues, but not found in - Nerve tissue Epithelium Skin appendages Bone Cailage', 'role': 'assistant'}]