What is the main characteristic of the Fused Deposition Technique (FDM)?

The main characteristic of the Fused Deposition Technique (FDM) is that it is a form of rapid prototyping. This process involves the layer-by-layer deposition of material to create a three-dimensional object. In FDM, a thermoplastic filament is heated until it melts, then extruded through a nozzle to build up the desired shape. This method is widely used for creating prototypes and models quickly and efficiently, making it a popular choice in various fields, including engineering and product design.

While FDM can be applied in areas related to tissue engineering for producing scaffolds (the reason why option B may seem relevant), the technique itself predominantly is recognized as a rapid prototyping method. It's not specifically a method for chemical synthesis or drug delivery, which are characteristics associated with other processes. Therefore, the identification of FDM as a form of rapid prototyping underscores its primary characteristic.