The answer is All of the above
Olfaction is not a tactile sensation, nor it's related to chewing food.
Olfactory receptors are chemical receptors in the nasal cavity that react with different odors creating the sense of smell that is interpreted in the brain.
So, olfaction is a chemical sensation that we experience while inhaling different odors through our noses.
You need to do speed divided by time
A RADIOLOGIST
IS THE ONE WHO DOES X-RAYS