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': 'Predisposing factors of Lung abscess-a) Altered sensoriumb) Dental sepsisc) Aggressive treatment of pneumoniad) Subpulmonic effusione) Endobronchial  obstruction \nSelect and explain. \nA. abcd, B. abde, C. acde, D. ade', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Predisposing factors of lung abscess are :\n\nAspiration of infective material : Seen in alcoholics, anaesthesia, sinusitis, gingivodental sepsis, coma, gastroesophageal reflux disease.\nAntecedent primary bacterial infection : postpneumonic abscess.\nSeptic embolism : thrombophlebitis, bacterial endocarditis, IV drug abusers.\nNeoplasia : causing obstruction to bronchopulmonary segment.\nMiscellaenous : Direct spread of infection from suppuration of subphrenic space, pleural cavity, esophagus, spine etc.\nWhen all these causes are excluded, there are still cases in which no reasonable basis for the abscess formation can be identified. These are referred to as primary cryptogenic lung abscesses.', 'role': 'assistant'}]