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: Physiology
[{'content': 'The best method to assess the adequacy of replacement of fluid in a case of shock is: \nSelect and explain. \nA. Decrease in thirst, B. Increased PaO, C. Increase in urine output, D. Blood pressure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The primary goal in fluid resuscitation for all forms of shock is the same: restoration of adequate end organ perfusion. Urine output is a quantitative and relatively reliable indicator of organ perfusion. It is a reflection of kidney perfusion and function and an indicator of renal, cardiovascular, and fluid volume status. Must know: Signs of a successful initial resuscitation: Improved blood pressure Improving level of consciousness Improving peripheral perfusion Decreasing tachycardia Decreasing lactate Normalizing pH Ref: Holcroft J.W., Anderson J.T., Sena M.J. (2010). Chapter 12. Shock & Acute Pulmonary Failure in Surgical Patients. In G.M. Dohey (Ed), CURRENT Diagnosis & Treatment:', 'role': 'assistant'}]