The lethal tumor dose is defined as the dose that will eradicate what percentage of the tumor yet preserve normal tissue

95%

Explanation:

The complete question is as follows:

The lethal tumor dose is defined as the dose that will eradicate what percentage of the tumor yet preserve normal tissue?

a) 85%

b) 95%

c) 65%

d) 75%

Radiation dose is used as a therapy of cancer as the radiation leads to the breakage of the DNA and hence, renders the cell incapable of growth and division. Lethal tumor dose is defined as the dose of radiation that is required for the production of complete eradication of tumor. The dosage of the radiation depends on the sensitivity of the target tissues to radiation along with the size of the tumor. The lethal tumor dose is defined as the dose that will eradicate 95% of the tumor however it would still preserve the normal tissue.