system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following is the mode of action of vasopressin?
assistant
The correct answer is  The action of vasopressin is increasing the permeability of collecting duct to water Aquaporin 2. The net effect is water retention in excess solute resulting in decreased effective osmotic pressure of body fluids. Ref: Ganong, 21st Edition, Page 235