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
The fluid mosaic model of membrane structure was proposed by 
Select and explain. 
A. Watson and Crick, B. Edward Angle, C. G.V. Black, D. Singer and Nicolson
D: Singer and Nicolson
Answer: D: Singer and Nicolson 
Explanation: None