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
A nucleic acid was analyzed and found to contain 32% adenine, 18% guanine, 17% cytosine and 33deg/o thymine. The nucleic acid must be: 
Select and explain. 
A. Single-stranded RNA, B. Single-stranded DNA, C. Double-stranded RNA, D. Double stranded DNA
D: Double stranded DNA
Answer: D: Double stranded DNA 
Explanation: D i.e. Double stranded DNA