You are given the following information about items A, B, C, and D. 
The unweighted aggregate price index in 2015 is
Definitions:
Papillae
Structures on the tongue that contain groupings of taste buds.
Gustatory Receptors
Specialized sensory cells located on the tongue that detect taste stimuli and convey taste signals to the brain.
Olfactory Epithelium
A thin layer of tissue, deep within the nasal cavity, containing the olfactory receptors; these sensory receptors produce information that is processed in the brain as smell.
Gustation
The sense of taste, one of the five traditional senses, which detects the chemical composition of substances through taste buds.
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