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': 'The morphological pattern of inflammation shown here is: \nSelect and explain. \nA. Serous, B. Fibrinous, C. Purulent, D. Chronic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Serous inflammation is marked by the exudation of cell poor fluid\xa0into spaces created by injury to surface epithelia into body cavities lined by the peritoneum,\xa0pleura,\xa0or pericardium. Typically, the fluid in serous inflammation is not infected by destructive organisms and does not contain large numbers of leukocytes. In body cavities, the fluid may be derived from the plasma (as a result of increased vascular permeability) or from the secretions of mesothelial cells (as a result of local irritation); accumulation of fluid in these cavities is\xa0called\xa0an\xa0effusion.\nReference-Robbins BASIC PATHOLOGY 10th edition pg- 78', 'role': 'assistant'}]