This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Impoence of phosphotidyl serin : 
Select and explain. 
A. Apoptosis, B. Surfactant, C. 2nd messanger, D. All
A: Apoptosis
Answer: A: Apoptosis 
Explanation: Phosphotidyl serin is usually present in the inner side of the membrane When it is exposed on the outside of the membrane it mediates apoptosis by "eat me" signels mediated by annexin 5