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: Pathology
[{'content': 'Least concentration of human immunodeficiency virus is seen in \nSelect and explain. \nA. Saliva, B. CSF, C. Blood, D. Semen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Viral load of HIV is maximum in blood, genital secretions like semen, and CSF\n\nIt also found in breast milk, saliva, lymphocytes, cell-free plasma, cervical secretions, saliva, tears, & minimal in urine\n\nSaliva can contain fibronectin & glycoproteins, which prevent transmission of the virus.\nA salivary protein called secretory leucocyte protease inhibitor also has anti-HIV activity', 'role': 'assistant'}]