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
Which is the sequence present next to shine- Dalgarno sequence in prokaryotes 
Select and explain. 
A. AUG, B. UAG, C. UGA, D. UAA
A: AUG
Answer: A: AUG 
Explanation: Shine Dalgarno is a marker sequence in prokarytes and it helps in indentification of initiator codon.