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
All of the following can be given through endotracheal tube, except 
Select and explain. 
A. Epinephrine, B. Lignocaine, C. Surfactant, D. Calcium
D: Calcium
Answer: D: Calcium 
Explanation: Lignocaine, epinephrine, atropine and vasopressin can be delivered down a catheter whose tip extends beyond endotracheal tube.