It is not true for Phylum Platyhelminthes:

Explanation

The correct answer is 'Radially symmetrical body'. Phylum Platyhelminthes is characterized by bilateral symmetry, meaning there is only one plane of symmetry that divides the body into left and right halves. In contrast, radial symmetry, which is incorrect for this phylum, involves multiple planes of symmetry that pass through a central axis, as seen in organisms like cnidarians. Additionally, Platyhelminthes are triploblastic metazoans with a dorsoventrally compressed body, which further distinguishes them from radially symmetrical organisms.