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: Medicine
[{'content': 'Mannitol infusion causes increase in \nSelect and explain. \nA. Blood viscosity, B. Osmolarity, C. Intra-ocular tension, D. Intercranial tension', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Omolarity", 'role': 'assistant'}]