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 of the following is a component of the visual pigment rhodopsin: 
Select and explain. 
A. 13-Carotene, B. Retinal, C. Retinol, D. Retinoic acid
B: Retinal
Answer: B: Retinal 
Explanation: B i.e. Retinal