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
Position with least vital capacity in G.A. 
Select and explain. 
A. Trendelenburg, B. Lithotomy, C. Prone, D. Lateral
A: Trendelenburg
Answer: A: Trendelenburg 
Explanation: A i.e. Trendelenburg In trendelenburg position, head end is lowered so due to gravity and weight of intra-abdominal viscera, diaphragm is at its highest level causing compression of lungs; so vital capacity is lowered.