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: Anatomy
Unpaired muscle of perineal body among the following is 
Select and explain. 
A. Bulbospongiosus, B. Longitudinal muscle of anal canal, C. Deep transverse perineal muscle, D. Levator Ani
B: Longitudinal muscle of anal canal
Answer: B: Longitudinal muscle of anal canal 
Explanation: The two Unpaired muscles of perineal body are

Longitudinal muscle of anal canal
External and sphincter