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': 'white plaque in eye due to vitamin A deficiency: \nSelect and explain. \nA. Pink spot, B. White spot, C. Bitot spot, D. Herald spot', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]