All of the following muscles contribute to  urogenital sphincter complex except: (A) Compressor urethrae, (B) Sphincter urethrae, (C) Urethrovaginal sphincter, (D) Bladder base detrusor muscle
Answer is D. Urogenital sphincter is composed of striated muscles:

Sphincter urethrae
Urethrovaginal sphincter
Compressor urethrae.