30. Phosphatidylinositol (PtdIns) is a small lipid to regulate diverse biological function. The activity/function of PtdIns can be modulated by kinases and phosphatases. The kinases-mediated phosphorylation is happening on hydroxyl positions of the inositol ring. Which position below is not the site for phosphorylation? (A) 3 hydroxyl position (B) 4 hydroxyl position (C) 5 hydroxyl position (D) 3 and 4 hydroxyl positions (E) 6 hydroxyl position