Smell is one of the important senses of the human body.
Tips
usage
More technical / clinical than 感觉 (gǎnjué, feeling). 官能 emphasizes the sense ORGAN's capacity - sight, hearing, etc. - while 感觉 is the subjective sensation.
memory
官 here is not 'official' but the older sense 'organ of the body' (compare 五官 wǔguān, the five facial features). 官能 = organ-capacity = sense.
