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: Surgery
A patient died on dental chair due to overdose of LA, cause for this can be 
Select and explain. 
A. Apnea, B. Hypercapnea, C. Cardiac arrest, D. Dyspnea
A: Apnea
Answer: A: Apnea 
Explanation: None