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': "Gaisbock's syndrome refers to: \nSelect and explain. \nA. Spurious erythrocytosis, B. Spurious thrombocytosis, C. Reactive thrombocytosis, D. Reactive erythrocytosis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Relative Erythrocytosis Hemoconcentration secondary to dehydration, diuretics, ethanol abuse, androgens or tobacco abuse It is Known as stress or spurious erythrocytosis or Gaisbock's syndrome Please NOTE: Not all patients with polycythemia rubra vera exhibit JAK2 mutation. Ref: Harrison, E-18,P-900", 'role': 'assistant'}]