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': 'In humans, the brain is considered to be "responsive" because? \nSelect and explain. \nA. It has control centers for all motor actions and sensory inputs, B. Every cell of brain has got specific function, C. It is a closed system and so not influenced by changes occurring outside, D. Its functions are profoundly affected by changes in external environment', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d. Its functions are profoundly affected by changes in external environmentIn humans, the brain is considered to be "responsive" as its functions are profoundly affected by changes in external environment', 'role': 'assistant'}]