This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
[{'content': 'Coenzyme required for tissue respiration is \nSelect and explain. \nA. Coenzyme Q, B. Coenzyme A, C. NADP, D. Cobamide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Coenzyme Q (CoQ) is a quinone derivative with a long, hydrophobic isoprenoid tail. It is also called ubiquinone because it is ubiquitous in biologic systems. CoQ is a mobile carrier and can accept hydrogen atoms both from FMNH2, produced on NADH dehydrogenase (Complex I) and from FADH2, produced on succinate dehydrogenase (Complex II).Ref: Harpers Biochemistry; 30th edition', 'role': 'assistant'}]