This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Physiology
[{'content': 'What is the best stimulus for release of vasopressin \nSelect and explain. \nA. Hypotonicity of extracellular fluid, B. Hypeension, C. Hypotension, D. Hypo-osmolality of extracellular fluid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Best / most impoant stimulus for ADH - Hypeonicity Next - hypotension Water deficit | |extracellular osmolarity |Osmoreceptors | ADH secretion (posterior pituitary) | |Plasma ADH | H2O permeability in |distal tubules. Collecting ducts | |H2O reabsorption | |H2O excreted 1. | Osmolality / tonicity 2. Aerial baroreceptor reflex - |aerial pressure - | ADH 3. Cardiopulmonary reflexes - | blood volume |ADH release |ADH release | plasma osmolality |plasma osmolality |blood volume |blood volume |blood pressure | blood pressure Nausea Hypoxia Drugs: Morphine Nicotine Cyclophosphamide Drugs: Alcohol Clonidine Haloperidol', 'role': 'assistant'}]