The hydrolysis of PIP2 by phospholipase C-β yields what membrane-soluble secondary messenger?
A) diacylglycerol (DAG) B) phosphatidylinositol (PI) C) phosphatidylinositol-4,5-bisphosphate (PIP2) D) inositol-1,4,5-trisphosphate (IP3) E) inositol-1,4-bisphosphate (IP2)