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: Medicine
Which part of spinal cord is involved in poliomyelitis? 
Select and explain. 
A. Posterior horn, B. Lateral column, C. Posterior column, D. Anterior horn
D: Anterior horn
Answer: D: Anterior horn 
Explanation: None