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': 'Which of the following deficiencies are associated with the disorders of hyperplasia of salivary gland and keratinisation of the salivary gland \nSelect and explain. \nA. Vit -A, B. Vit -B, C. Vit -C, D. Vit - K', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]