Male gametophyte with least number of cells is present in Pteris, Funaria, Lilium, Pinus?

Lilium is an angiosperm plant, in which male gametophyte is 3 - celled and most reduced gametophyte as compared to Funaria (bryophyte). As we proceed from Thallophyta to angiosperms, there is a reduction in the gametophytic generation they become more and more dependent on sporophyte. In each of the plant groups that succeeded bryophytes, the gametophyte became less and less prominent. In angiosperms like Lilium, the male gametophyte (pollen - grain) is highly reduced and is only a 3 -celled structure. So, the correct answer is 'Lilium'