This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Biochemistry
[{'content': 'If the percentage of thymine residues in DNA is 28%. What is the percentage of cytosine? \nSelect and explain. \nA. 28%, B. 44%, C. 36%, D. 22%', 'role': 'user'}, {'content': "Answer: D \nExplanation: According toChargaff's rulein double-stranded DNA, the total purine content is equal to the pyrimidine content. In a double stranded DNA, Chargaff's rule is followed Since =, so = 28% + = 28+28 = 56 % + = 100-(+) = 100-56% =44% As = , so = 44 /2 =22% Chargaff's Rule only applies to double-stranded DNA, due to the complementary base pairing that occurs between A-T and C-G.", 'role': 'assistant'}]