The Second Step in the First Stage of Cholesterol Biosynthesis

The second step in the first stage of cholesterol biosynthesis leading to production of HMG CoA involves a condensation reaction of:

A) Acetyl CoA and malonyl CoA which is reversible.
B) Acetyl CoA and malonyl CoA which is irreversible.
C) Acetyl CoA and Acetoacetyl CoA which is reversible.
D) Acetyl CoA and Acetoacetyl CoA which is irreversible.
E) None of the above.