This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'In syncope, which of the following is not seen: \nSelect and explain. \nA. Cold extremities, B. Vomiting, C. Pupil constriction, D. Faint', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]