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: Dental
[{'content': 'Nutrient artery supplying the bone enters from which end \nSelect and explain. \nA. Away from the growing end, B. Towards the growing end, C. No fixed entry point, D. Metaphyseal end', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nutrient artery: it enters the shaft through nutrient foramen run obliquely through the cortex and divides into ascending and descending branches in the medullary cavity\nThe nutrient artery supplies medullary cavity, inner 2/3 of cortex and metaphysics\nEach branch divide into a number of small parallel channels which terminate in the adult metaphysis by anastomosing with epiphysial, metaphysical and periosteal arteries', 'role': 'assistant'}]