Whenever Claire goes to the dentist, she becomes anxious and cries. She was not afraid of the dentist on her first visit, so her fear was a learned behaviour. The UCS in this case was probably

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Since Claire was not afraid of the dentist on her first visit, it can be assumed that something occurred during a subsequent visit that made her anxious and cry. The most likely UCS in this scenario would be an uncomfortable procedure, such as a painful injection or teeth cleaning. The other options (sweet toothpaste, the dentist's beard, and small prizes given after the exam) are unlikely to cause a significant enough emotional response to result in a fear response like Claire's.

Whenever Claire Goes to the Dentist, She Becomes Anxious and Cries