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: Physiology
Which is not a medial pathway involved in the maintenance of posture? 
Select and explain. 
A. Reticulospinal tract, B. Rubrospinal tract, C. Tectospinal tract, D. Vestibulospinal tract
B: Rubrospinal tract
Answer: B: Rubrospinal tract 
Explanation: Rubrospinal tract and lateral corticospinal tract are lateral tracts.
Anterior corticospinal tract, vestibulospinal tract, reticulospinal tract and tectospinal tract are medial tracts.