Passage Summary: Brain scans can show what your face looks like, which means they can identify you directly, unlike DNA profiles which need a paper trail to be linked to a name.

Reasoning: An fMRI contains private data and enough information about the skull to reconstruct a person's face, whereas a genetic profile requires external records to be linked to a specific individual.

Analysis: The stimulus sets up a contrast between two types of medical data: genetic profiles and fMRIs. The key takeaway is that an fMRI is 'self-identifying' because it contains facial structure, while a genetic profile is just a string of data that needs a 'key' (labels or records) to identify the person. We should look for an answer that concludes that fMRIs pose a more direct privacy risk or are harder to keep anonymous than genetic profiles. The facts are pushing us toward a conclusion about the ease of identification.