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': 'The pathway of which system crosses in the ventral white commissure of the spinal cord within a few segments of entry and then courses to the thalamus contralateral to the side of the body from which the signal originated? \nSelect and explain. \nA. Anterolateral system, B. Dorsal column-medial lemniscal system, C. Coicospinal system, D. Spinocerebellar system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fibers in the anterolateral system cross in the anterior white commissure within a few segments of their entry before ascending on the contralateral side. Signals ascending in the dorsal column-medial lemniscal system do not cross until they reach the dorsal column nuclei in the medulla.', 'role': 'assistant'}]