MSFinals-5056

A 17-year-old girl presents to the Emergency Department on a Saturday night with complaints of palpitations and feeling unwell. Her friends report that she had a negative reaction to the alcohol they consumed and deny any use of illegal substances. Upon examination, she appears anxious and is holding onto her chest. Her pupils are dilated, and her pulse rate is 110/min, blood pressure 135/92 mmHg. She mentions feeling nauseous. Which of the following substances could be responsible for her symptoms?