Oído.
Since the infinitive verb is oír, which stems ends with a vowel (i in this case), we replace the inifinitive part ir with oído. Remember to include the accent since its an irregular form.
Explanation:
<em>Means: </em><em>What does the dental pulp consist of?</em>
<em>Hope it is useful for you</em><em>^_^</em>
He doesn’t know your name because he asks “¿Como te llamas?” That means what is your name.
