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': 'Familial dysautonomia is characterised by absence of: \nSelect and explain. \nA. Fungiform papilla, B. Circumvallate papilla, C. Filiform papilla, D. Both 1 and 2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Familial dysautonomia is characterised by absence of both fungiform and circumvallate papilla.', 'role': 'assistant'}]