Porphyrin of heme (hemoglobin) is synthesized by liver by combining acetic acid with the amino acid

The correct option is D Glycine
The first step in the biosynthesis of porphyrin is the formation of -aminolevulinic acid (-ALA) by the reaction of the amino acid glycine with succinyl-CoA. Two molecules of -ALA are then combined by Porphobilinogen synthase to give Porphobilinogen (PBG), which contains a pyrrole ring. Four PBGs are then combined through deamination into Hydroxymethyl bilane (HMB), which is hydrolysed to form the circular tetrapyrrole Uroporphyrinogen III. This molecule undergoes a number of further modifications and the main end-product is Protoporphyrin IX. Then Protoporphyrin IX is combined with iron to form heme. One of the best-known porphyrins is heme, the pigment in red blood cells, a cofactor of the protein hemoglobin.