Whichever one you picked, you're not alone. Smell is the only sense that reaches the mind without a translator, and behind each answer sits a small, specific piece of science."
A meal from childhood
Most of what we call taste is actually smell. Chewing sends aroma molecules up the back of the throat to the same receptors used for breathing in, so a childhood dish is remembered by nose more than by tongue. Newborns can pick out their own mother's scent within days of birth, and the olfactory bulb is one of the only parts of the adult brain that keeps generating new neurons throughout life. The dish disappears; the wiring that remembers it keeps renewing itself for as long as you live.
Rain on dry earth
That scent has a name: petrichor. Rain striking dry ground releases plant oils built up during drought, along with geosmin, a compound made by soil bacteria, both flung into the air as fine mist. Human noses detect geosmin at around 5 parts per trillion, more sensitively than a shark detects blood in water. Some researchers think the pull we feel toward that smell predates language, a body still remembering that rain meant survival.
A person no longer here
In blind tests, people can pick out a shirt worn by a family member from among strangers' shirts at far better than chance, often without being able to say how. Visual memories fade within a few years; scent memories tied to a specific person have been shown to stay accurate for decades with far less distortion. That's the mechanical reason a stranger's perfume can undo you in the street: your nose isn't guessing. It's matching a record that never degraded.