This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
Enzymes not impoant in testosterone biosynthesis 
Select and explain. 
A. 5-aplha reductase, B. Delta 5-4 isomerase, C. 18 hydroxylase, D. Alpha hydroxylase
C: 18 hydroxylase
Answer: C: 18 hydroxylase 
Explanation: Progesterone is conveed to 18hydroxyprogestrone by 18 -hydroxylaseThese reactions are effected by hydroxylationThese specific hydroxylases are mono-oxygenasesRef: DM Vasudevan, 7th edition, page no: 665