Explanation:

‘Palette’ means a thin board or slab on which an artist lays and mixes colours

‘Palate’ means the roof of the mouth, separating the cavities of the mouth and nose in vertebrates

In the given sentence the spelling of the word “palate” was wrong.

“Palette” does not mean anything in the given sentence. It has to be substituted with the word “palate” to make the sentence correct.

Correct Sentence:

While examining the patient, the ENT specialist noticed that his patient’s palate was unusually bent towards the base of the mouth.

Hence, option C is the correct answer.