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': 'Absence of fungiform and circumvallate papillae seen in: \nSelect and explain. \nA. Familial dysautonomia., B. Iron deficiency anemia., C. Scarlet fever., D. Riboflavin deficiency.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]