This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sensory System, Subject name: Physiology
[{'content': "The principle that in spinal cord, the dorsal roots are sensory and the ventral roots are motor, is known as: \nSelect and explain. \nA. Bell-Magendie law, B. Dale's principle, C. Monro-Kellie hypothesis, D. Muller's doctrine", 'role': 'user'}, {'content': "Answer: A \nExplanation: Bell Megendie Law: States that in spinal cord, the dorsal roots are sensory and the ventral roots are motor. Dale's principle: Same neurotransmitter is released at all branches of a neuron. Monro Kellie hypothesis: The blood volume in the cranial cavity is approximately constant. As the cranium is rigid (except in a young child) and as the brain is viually incompressible the combined volume of brain tissue, cerebrospinal fluid (CSF), and intracranial blood is nearly constant. Muller's doctrine of specific nerve energies: When a paicular nerve pathway from a paicular sense organ is stimulated, the sensation produced is that for which the receptor is specialized, no matter how the pathway was stimulated.", 'role': 'assistant'}]