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
This pattern of capnograph is seen in 
Select and explain. 
A. Spontaneous breathing, B. Endotracheal tube obstruction, C. Malignant hyperthermia, D. Unidirectional valve malfunction
B: Endotracheal tube obstruction
Answer: B: Endotracheal tube obstruction 
Explanation: The shark finn pattern capnograph is seen in endotracheal tube obstruction