In dicots, root cap is formed by
A. Dermatogen is the primary meristem that forms the outermost layer of a plant or a plant part and forms the epidermis.
B. Calyptrogen is a specialized layer of rapidly dividing cells present at the root tips which continuously divide to form the root cap is formed.
C. Wound cambium is formed within amasses of cells (callus) which grow over the injured surface of a wound to heal and repair that part.
D. Vascular cambium is a lateral meristem that develops within the vascular bundles to produce xylem to the inner side and phloem to the outer side and is also called fascicular cambium.
So, the correct answer is A.