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: Pharmacology
High concentration of bupivacaine during labour is contraindicated due to its 
Select and explain. 
A. CNS depressant action, B. CNS stimulant action, C. Cardiotoxicity, D. Hypersensitivity reaction
C: Cardiotoxicity
Answer: C: Cardiotoxicity 
Explanation: None