This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Membrane and transpo protiens, Subject name: Physiology
[{'content': 'Which cell adhesion molecules (CAM) is calcium mediated? \nSelect and explain. \nA. Cadherin, B. NCAM, C. IgSF, D. Fibronectin binding protein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Type of CAM Subtypes Distribution Calcium- dependent 1. Cadherins 2. Selectins 3. Integrins - Most cells including epithelia - Migrating cells E.g.: leucocytes - b/w cells & intercellular substance. About 20 types; each attaching to an extracellular molecule. CALCIUM INDEPENDENT: 1. Neural cell adhesion molecule (NCAM) - nerve cells 2. Intercellular adhesion molecule (ICAM) - leucocytes.', 'role': 'assistant'}]