鈣離子（calcium ion）是細胞內重要之二級訊息傳遞者，下列何種物質可影響細胞內鈣離子的濃度？
phosphatidylcholine+phospholipase A
phosphatidylcholine+phospholipase C
phosphatidylinositol+phospholipase A
phosphatidylinositol+phospholipase C
