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: Anatomy
[{'content': 'Lower end of humerus ossifies from how many secondary ossification centers \nSelect and explain. \nA. 1, B. 2, C. 4, D. 6', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., 4The humerus ossifies from one primary center and 7 secondary centersThe upper end ossifies from 3 secondary centers head (1" year)agreater tubercle (2\' year)alesser tubercle (5th year).The lower end ossifies from 4 secondary centers which form 2 epiphyses.The center (fouh center) for medial epicondyle appears at 4-6 years, forms a separate epiphysis and fuses with shaft during 20th year.', 'role': 'assistant'}]