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
The duration of spinal anaesthesia depends on all of the following EXCEPT : 
Select and explain. 
A. Local anaesthetic that is used, B. Concentration of the local anesthetic used, C. Posture of the patient, D. Whether adrenaline has been added to the local anaesthetic
C: Posture of the patient
Answer: C: Posture of the patient 
Explanation: None