This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following amino acid is required for the synthesis of haem? 
Select and explain. 
A. Lysine, B. Glycine, C. Arginine, D. Glutamine
B: Glycine
Answer: B: Glycine 
Explanation: Glycine is the starting amino acid for porphyrin synthesis.