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: Biochemistry
Not a marker for muscle tumor 
Select and explain. 
A. Desmin, B. Actin, C. Neurofilament, D. Intermediate filament
C: Neurofilament
Answer: C: Neurofilament 
Explanation: Markers for smooth muscles tumor are : (t) Muscle specific actin, (ii) Intermediate filament, and (iii) Desmin. Neurofilament is a marker of neural tumors.