This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Gene is 
Select and explain. 
A. Codon, B. Anticodon, C. Cistron, D. Okazaki fragment
C: Cistron
Answer: C: Cistron 
Explanation: A cistron is a gene. The term cistron is used to emphasize that genes exhibit a specific behavior in a cis-trans test; distinct positions (or loci) within a genome are cistronics The words cistron and gene were coined before the advancing state of biology made it clear that the concepts they refer to are practically equivalent. Ref satyanarayana 4e