The starting material for ketogenesis is:: (A) Propionyl-CoA, (B) Acetyl  CoA, (C) Acetoacetyl-CoA, (D) Acyl CoA
Answer is C. Acetoacetyl-CoA, which is the starting material for ketogenesis, also arises directly from the terminal  four carbons of a fatty acid during β-oxidation.
HARPERS ILLUSTRATED BIOCHEMISTRY30th ed page no 227