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: Anatomy
Posterior cord of brachial plexus is formed by? 
Select and explain. 
A. Ventral division of upper trunk, B. Dorsal division of upper trunk, C. Ventral divisions of upper, middle & lower trunks, D. Dorsal divisions of upper, middle & lower trunks
D: Dorsal divisions of upper, middle & lower trunks
Answer: D: Dorsal divisions of upper, middle & lower trunks 
Explanation: Ans. is 'd'i.e., Dorsal divisions of upper, middle & lower trunks