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
Alpha helix and Beta pleated sheet are examples of: 
Select and explain. 
A. Primary structure, B. Secondary structure, C. Teiary structure, D. Quaternary structure
B: Secondary structure
Answer: B: Secondary structure 
Explanation: B i.e. Secondary structure