This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'At the end of 5th week of gestation, how many numbers of somites can be seen? \nSelect and explain. \nA. 24, B. 26, C. 38, D. 44', 'role': 'user'}, {'content': "Answer: D \nExplanation: The first pair of somites arises in the occipital region of the embryo at approximately the 20th day of development, from here new somites appear in craniocaudal sequence at a rate of approximately three pairs per day until at the end of the fifth week 42 to 44 pairs are present Ref: Gray's 39e/p-210-220", 'role': 'assistant'}]