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: Pharmacology
[{'content': 'Mannitol when given UV causes - \nSelect and explain. \nA. | Blood viscosity, B. | Blood viscosity, C. | GFR, D. | ICT', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' | Blood viscosity Mannitol decreases blood viscosity.", 'role': 'assistant'}]