This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Core body temperature is closest to \nSelect and explain. \nA. Rectal, B. Surface, C. Oral, D. Axillary', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Rectal [Ganong22-251; 19th*-239/# Rectal temperature is representative of the temperature at the core of the body and varies least with changes in environmental temperature. Oral temperature is normally 0.5 degC lower than the rectal temperature, but it is affected by many factors, including ingestion of hot or cold fluids, gum-chewing, smoking, and mouth breathing.', 'role': 'assistant'}]