This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerves of Abdomen, Subject name: Anatomy
Spinal cord and nerve roots are supplied by - 
Select and explain. 
A. Anterior spinal artery, B. Posterior spinal artery, C. Ascending cervical artery, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e., All of the above