This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brainstem lesions and blood supply of CNS, Subject name: Anatomy
Which of the following structures is involved in the paramedian infarction of the base of the pons? 
Select and explain. 
A. Anterior spinocerebellar tract, B. Descending trigeminal tract, C. Pyramidal tract, D. Rubrospinal tract
C: Pyramidal tract
Answer: C: Pyramidal tract 
Explanation: Base of the pons includes coicospinal (pyramidal), coicobulbar, coicopontine tracts, pontine nuclei, and transverse pontine fibers. so in paramedian infarction of base of pons coicospinal (pyramidal ) tract is affected.