Question

What isotope is commonly used to kill cancer cells?
A) U-236
B) Eu-94
C) Ir-31
D) U-235

Answer 1

A because its Iodine, and Iodine is U-236.

Answer 2

It is Iridium or Ir-31 is the closest answer I could find for you. The actual Iridium used is Ir-192.
Another problem was that Uranium/U is not the one used its Radium so that can not be it.
And Europium is used for helping with curing brain tumors but only in trace amounts