All of these are dental auxiliary dental materials except:
(A) Dental impression wax (B) Ceramic (C) Casting investment (D) Impression compound
(B) Auxiliary dental material—Substance that is used in the construction of a dental prosthesis but that does not become a part of the structure.
Auxiliary dental materials are substances used in the process of fabricating dental prostheses and appliances but that do not become part of these devices. These include acid-etching solutions, impression materials, casting investments, gypsum cast and model materials, dental waxes, acrylic resins for impression and bleaching trays, acrylic resins for mouth guards and occlusion aids, and finishing and polishing abrasives.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 3, 5