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: Surgery
[{'content': 'Body water content in percentage of body weight is lowest in - \nSelect and explain. \nA. Well-built man, B. Fat woman, C. Well nourished child, D. Fat man', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lean tissues such as muscle and solid organs have higher water content than fat and bone. Thus, young lean males have a higer proportion of body weight as water than elderly or obese persons. Females as such have a lower percentage of total body water because of less muscle mass and more fat.', 'role': 'assistant'}]