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 bottom sign in sleeping sickness caused by T. brucei Gambiense refers to: \nSelect and explain. \nA. Unilateral conjunctivitis, B. Posterior cervical lymphadenopathy, C. Narcolepsy, D. Transient erythema', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Posterior cervical lymphadenopathy(Ref: Harrison, 18th/e, p. 1720; 17th/e, p. 1304)* Lymphadenopathy, particularly of the posterior triangle of the neck - Winter bottom's sign.", 'role': 'assistant'}]