(D) The upper surface of the tongue has small projections called papillae.There are $4$ main types of papillae found on the human tongue:$1$. Fungifor

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(D) The upper surface of the tongue has small projections called papillae.There are $4$ main types of papillae found on the human tongue:$1$. Fungiform papillae$2$. Filiform papillae$3$. Foliate papillae$4$. Vallate (or Circumvallate) papillaeTherefore,the correct answer is $4$.