In humans, telomeres have the following sequence: (A) 5'-GGCTTG-3', (B) 5'-TTAGGG-3', (C) 5'-TAACGT-3', (D) 5'-GTAGGC-3'
Answer is B. The ends of each chromosome contain structures called telomeres. Telomeres consist of sho TG-rich repeats. Human telomeres have a variable number of repeats of the sequence 5'-TTAGGG-3', which can extend for several kilobases. Ref: Biochemistry by U. Satyanarayana 3rd edition Pgno : 531