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': 'All of the following can be given through endotracheal tube, except \nSelect and explain. \nA. Epinephrine, B. Lignocaine, C. Surfactant, D. Calcium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lignocaine, epinephrine, atropine and vasopressin can be delivered down a catheter whose tip extends beyond endotracheal tube.', 'role': 'assistant'}]