This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'Winter bottoms sign in sleeping sickness refers to - \nSelect and explain. \nA. Unilateral conjunctivitis, B. Posterior cervical lymphadenopathy, C. Narcolepsy, D. Transient erythema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Generalized or regional lymphadenopathy - Posterior cervical lymphadenopathy (Winterbottom sign) is characteristic of T brucei gambiense African trypanosomiasis', 'role': 'assistant'}]