This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology and Histology, Subject name: Anatomy
All of the following muscles are derivatives of para axial mesoderm except- 
Select and explain. 
A. Masseter, B. diaphragm, C. biceps femoris, D. detrusor
D: detrusor
Answer: D: detrusor 
Explanation: Para axial (somite) derivatives- dermatome (lateral pa)- skin dermis myotome (middle pa)- skeletal muscles sclerotome (medial pa)- bone (veebrae, occipital skull bone) option 1,2 and 3 are skeletal muscles. Detrusor is a smooth muscle of genitourinary system derived from intermediate mesoderm.