The correct option is C Premolars
The set of teeth present till 6 years of age is called milk teeth. Between the ages of about 6 and 7 years, the primary teeth start to fall and the second set of teeth, also known as permanent teeth begin to come through. Two sets of incisors and one set of canines are present in both adult and baby teeth. Children till 6 years of age have two sets of molars whereas adults have three sets of molars. Premolars are developed once the milk teeth fall off and when the permanent teeth start growing. Hence, premolars are not a part of the milk teeth and are only seen in a permanent set of teeth.