Which of the following core material resists condensation pressure well enough?

Core with admixed amalgam can be build without post retained through chamber retention (that is amalcore). In 1980, Nayyar and Walton described the amalcore, or coronal-radicular or admixed amalgam restoration. This technique advocates the removal of gutta-percha (2.0–3.0 mm) from the coronal third of the obturated root canals followed by core buildup into this space along with the pulp chamber space. These intraradicular extensions of the core material act as effective retentive aids. The coronal-radicular build-up has proved to be a predictable and cost-effective restorative modality for posterior endodontically treated teeth.