The Conventional View That All Tastes Are Encoded by Various

Multiple Choice

The conventional view that all tastes are encoded by various combinations of activity in five primary taste receptors has a problem:

A) No receptors have been discovered for salty and sour.
B) Evidence suggests that there may be more than five primary tastes.
C) Many tastes cannot be created from combinations of the five current primaries.
D) Thirty receptors have been discovered for bitter.
E) all of the above