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': 'Rise in end-tidal CO2 during thyroid surgery can be due to all except – \nSelect and explain. \nA. Anaphylaxis, B. Malignant hyperthermia, C. Thyroid storm, D. Neuroleptic malignant syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anaphylaxis is generally associated with hypotension, shock, and hypoperfusion of lungs and results in decreased End Tidal CO2 measurements.\nThyroid storm (hypermetabolic state), malignant hyperthermia and neuroleptic malignant syndrome can cause rise in ETCO2.', 'role': 'assistant'}]