This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
[{'content': 'Which of these syndromes is associated with microcephaly? \nSelect and explain. \nA. Down syndrome, B. Edward syndrome, C. Cri-du-chat syndrome, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. All of theseMicrocephaly or small head is subdivided into primary and secondary microcephaly. Primary microcephaly usually follows a Mendelian pattern of inheritance or is associated with certain syndromes. Down syndrome (trisomy 21), Edward syndrome (trisomy 18), Cri-du-chat syndrome (5p-), and Cornelia de Lange syndrome are associated with microcephaly.', 'role': 'assistant'}]