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: Anaesthesia
[{'content': 'Mendelson syndrome is due to – a) Aspiration pneumonitisb) Chemical pneumonitisc) Oesophagitisd) Oesophageal spasm \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': "Answer: B \nExplanation: Mendelson's syndrome is aspiration pneumonitis caused by aspiration of gastric fluid into the lung.\nAspiration pneumonitis is a chemical pneumonitis due to chemical reaction produced by gastric acid.", 'role': 'assistant'}]