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
[{'content': 'Which is a common metabolic process in human as well as bacteria \nSelect and explain. \nA. Purine synthesis, B. Nitrogen fixation, C. Mucolipid formation, D. Nonoxidative photophosphorylation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All forms of life (except protozoa) synthesize purine and pyrimidine nucleotides.', 'role': 'assistant'}]