This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
[{'content': 'Who described conditioned reflex: \nSelect and explain. \nA. Pavlov, B. Salk, C. Sherrington, D. Priestly', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. PavlovIVAN PETROVICH PAVLOV was a Russian physiologist. He won the Nobel Prize in medicine in 1904. He is remembered particularly for his work on conditioned response.', 'role': 'assistant'}]