Which of the following are derivatives of amino acid Glycine: (A) Heme, (B) Creatinine, (C) Glutathione, (D) All of the above
Answer is D. Derivatives of Glycine are:

Heme
Purine ring
Glutathione
Creatine, creatine phosphate, creatinine

Note: Glycine is not a part of pyramidine ring.