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
Winter bottom sign in sleeping sickness caused by T. brucei Gambiense refers to: 
Select and explain. 
A. Unilateral conjunctivitis, B. Posterior cervical lymphadenopathy, C. Narcolepsy, D. Transient erythema
B: Posterior cervical lymphadenopathy
Answer: B: Posterior cervical lymphadenopathy 
Explanation: 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.