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: Pathology
[{'content': 'All of the following act as cell adhesion molecules, EXCEPT: \nSelect and explain. \nA. Integrin, B. Selectin, C. Cadherin, D. Lecithin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most adhesion proteins, also called CAMs (cell adhesion molecules), can be classified into four main families: immunoglobulin family CAMs, cadherins, integrins, and selectins. Ref: Robbins 8th edition, Chapter 3.', 'role': 'assistant'}]