Which of these nanoprobes can detect cancer cell nuclei as well as deliver anticancer drug directly to the nuclei region?

Correct Answer: Er/Yb doped NaYF4 core and NaGdF4 shell UCNPs
Multifunctional upconversion nanoprobes made up of Er/Yb-doped NaYF4 core and NaGdF4 shell are used to both target cancer cell nuclei and deliver the anticancer drug directly to the nuclear region. The real time imaging of the cells can be done via magnetic resonance. The DOX delivery to the nucleus is done in synchronous with the monitoring of the nanoparticle.