Given below are two statements - one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): MRI provides images of brain activity rather than brain images
Reasons (R): Results in MRI are obtained from the measurement of waves that hydrogen atoms emit when they are activated by radio-frequency waves in a magnetic field
In the light of the above two statements choose the correct option:

Correct option is D

Assertion (A) is false because traditional MRI (Magnetic Resonance Imaging) provides detailed structural images of brain anatomy, not functional activity; it is fMRI (functional MRI) that measures brain activity through blood oxygenation changes. Reason (R) is true as it accurately describes the MRI mechanism: hydrogen atoms in tissue emit radio-frequency signals when excited in a magnetic field, which are detected to construct anatomical images. However, this mechanism produces structural imaging, contradicting the assertion about activity measurement.

Information Booster:
● MRI: Structural neuroimaging technique providing high-resolution anatomical brain images
● fMRI (functional MRI): Measures brain activity through BOLD (blood oxygen level dependent) signal changes
● MRI physics: Based on nuclear magnetic resonance of hydrogen protons in water and fat molecules
● Radio-frequency pulses: Excite hydrogen atoms, which emit detectable signals during relaxation
● Distinction: MRI = structure; fMRI = function/activity; PET/SPECT = metabolic activity
● Clinical applications include detecting tumors, lesions, structural abnormalities, and anatomical variations