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
The first sign of intrathecal injection following placement of caudal epidural with 0.25% bupivacaine in a 1 year old child would be 
Select and explain. 
A. Hypotension, B. Bradycardia, C. Falling oxygen saturation, D. Tachycardia
C: Falling oxygen saturation
Answer: C: Falling oxygen saturation 
Explanation: Hemodynamic instability is seen with intrathecal injecction in Younger children and infants. Apnea is first sign of total spinal in infants and younger children.