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
Chitin contains- 
Select and explain. 
A. a) Alpha 1-4 bond, B. b) Alpha 1-6 bond, C. c) Beta 1-6 bond, D. d) Beta 1-4 bond
D: d) Beta 1-4 bond
Answer: D: d) Beta 1-4 bond 
Explanation: Explanation- Chitin- Made up of N Acetyl D Glucosamine joined by b1 ------- 4 linkage.