Question: What are the four main types of taste buds on the tongue?
Answer: Circumvallate
Fungiform
Filiform
Fungiform papillae, Foliate papillae, Circumvallate papillae, and Filiform papillae
Circumvallate papillae
Foliate papillae
Fungiform papillae
Foliate
Filiform papillae
Natural Questions answer: sour
bitter
sweet
salty (from the Wikipedia article "Taste bud")