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': 'What is Ranne complex? \nSelect and explain. \nA. Necrotic material undergoing calciﬁcation, B. The stage is seen in the formation of granuloma, C. Central necrosis surrounded by lymphocytes, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: The central part of the TB lesion contains caseous, soft, and cheesy necrotic material (caseous necrosis). This necrotic material may undergo calcification at a later stage called Ranne complex, in the lung parenchyma and hilar lymph nodes in few cases.\nKey concept:\nNecrotic material undergoing calciﬁcation which is seen in TB is known as Ranne\xa0complex.\nRef: Shafer's textbook of oral pathology 7th edition page 320", 'role': 'assistant'}]