Which of the Following Hormones Acts by an Inositol 1,4,5-Triphosphate $\left.\mathrm{IP}_{3}\right)-\mathrm{Ca}^{2+}$

Multiple Choice

Which of the following hormones acts by an inositol 1,4,5-triphosphate ( $\left.\mathrm{IP}_{3}\right) -\mathrm{Ca}^{2+}$ mechanism of action?

A) 1,25-Dihydroxycholecalciferol
B) Progesterone
C) Insulin
D) Parathyroid hormone (PTH)
E) Gonadotropin-releasing hormone $(\mathrm{GnRH})$