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
Pentothiol sodium should preferablay be injected into – 
Select and explain. 
A. Femoral vein, B. Antecubital vein, C. Neck vein, D. Veins on outer aspect of fore arm
D: Veins on outer aspect of fore arm
Answer: D: Veins on outer aspect of fore arm 
Explanation: Inadverent intra-arterial injection occurs when thiopentone is injected in antecubital vein because in 10% of the cases brachial artery divides above elbow giving a very superficial abnormal artery which lies deep to antecubital vein. Therefore thiopentone injection should be given in the veins over the outer aspect of forearm (not in antecubital vein).