This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic and genetic disorders, Subject name: Pediatrics
[{'content': 'Edward syndrome is \nSelect and explain. \nA. Trisomy 13, B. Trisomy 18, C. Trisomy 21, D. Trisomy 20', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Edward syndrome is trisomy 18 . It is due to non dysfunction of chromosomes during meiosis Trisomy 21 is down symdrome and trisomy 13 is patau syndrome. Reference: Nelson TB of pediatrics pg 404 edi 19.', 'role': 'assistant'}]