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': 'Characteristic feature of viral pneumonias is ? \nSelect and explain. \nA. Interstitial mononuclear infiltration, B. Intra-alveolar proteinaceous exudate, C. Hyaline membrane lining alveoli, D. Fibrotic septa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Interstitial mononuclear infiltration The predominant histological pattern in case of viral penumonias is the interstitial nature of the inflammatory reaction viually localized within the walls of the alveoli. The infiltrates are usually mononuclear cells such as -lymphocytes, histocytes, plasma cells", 'role': 'assistant'}]