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': 'Earliest system to be function in fetus is ? \nSelect and explain. \nA. CNS, B. GIT, C. Circulatory, D. Genitourinary', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Circulatory Fetal period extends from the beginning of 3rd month to the end of intrauterine life (till bih). It is the period of maturation of tissues and organ and rapid growth of body occurs. By the end of organogenesis (end of embryonic period) most of the organ systems are developed, however, the function of most of them is negligible except cardiovascular system (cardiovascular system is first to function).", 'role': 'assistant'}]