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: Pathology
[{'content': 'Edwards syndrome is - \nSelect and explain. \nA. Trisomy 21, B. Trisomy 18, C. Trisomy 13, D. 5 P', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Trisomy 18", 'role': 'assistant'}]