What is the basis of most useful classification of medications in medical chemistry?

To diagnose the medical conditions, MRI technique is used. Which is not used in MRI?

The radiations used in the treatment of muscle ache are :

Who among the following scientists introduced the concept of immunization to the medical world?

Which of the following is mRNA vaccine used against Covid-19 infection?

The radioisotope used in the detection of tumour is :