This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
[{'content': "The following are true regarding Lyme's Disease, except:- \nSelect and explain. \nA. lt is transmitted by ixodid tick., B. Erythema chronicum migrans may be a clinical feature, C. Borrelia recurrentis is the aetiological agent, D. Rodents act as natural hosts", 'role': 'user'}, {'content': "Answer: C \nExplanation: Option 1, 2, 4 Lyme's disease Causative agent = B. burgdorferi Transmitted by bite of Ixodid ticks /Hard tick Replicates locally & invades locally Centre - periphery Erythema Chronicum migrans Annular rash / bull's eye. Associated with ch. ahritis Option 3 B. recurrentis: causes Relapsing fever Reason for relapse is antigenic variation, shown by its causative agent B. recurrentis.", 'role': 'assistant'}]