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': 'The first sign of intrathecal injection following placement of caudal epidural with 0.25% bupivacaine in a 1 year old child would be \nSelect and explain. \nA. Hypotension, B. Bradycardia, C. Falling oxygen saturation, D. Tachycardia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hemodynamic instability is seen with intrathecal injecction in Younger children and infants. Apnea is first sign of total spinal in infants and younger children.', 'role': 'assistant'}]