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
Amyotrophic lateral sclerosis involve- 
Select and explain. 
A. Anterior horn cell, B. Posterior horn cell, C. Ventral root ganglia, D. Myoneural junction
A: Anterior horn cell
Answer: A: Anterior horn cell 
Explanation: None