Which of the following are used in $MRI$ to detect physiological changes in living tissues?
$(i)$ $UV$ rays $(ii)$ Strong magnetic fields $(iii)$ $\gamma$-rays $(iv)$ $X$-rays

  • A
    $(ii)$ only
  • B
    $(i)$ and $(iv)$
  • C
    $(ii)$ and $(iii)$
  • D
    $(i)$ and $(iii)$

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