The correct option is
D Drupe
Drupe is a succulent type of fruit with a thin membranous epicarp, fleshy mesocarp and stony hard endocarp which encloses the seed. Almond is a drupe and when the endocarp is cracked open it reveals the seed whose cotyledons are edible. Berries are simple, succulent type of true fruits which have a fleshy and edible pericarp (includes epicarp,mesocarp,endocarp). No part of a berry is hard or inedible except the seed.
Nut is an indehiscent fruit with pericarp hardening to form the shell which encloses the seed.
Regma is a kind of schizocarp fruit which splits into three or five cocci as it is derived from a syncarpous ovary. So, the correct answer is 'Drupe'