Which of the following structures in Pinus are haploid

Options

A. Megaspore, integument, root
B. Endosperm, megaspore, pollen grain
C. Pollen grain, leaf, root
D. Megaspore, endosperm, embryo

Answer

B

Explanation

In gymnosperm like lycas/pinus endosperm of female gametophyte is haploid and formed before fertilization. Megaspore and microspore arises by meiotic division thus it is haploid.