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
True about causative agent of MALTA FEVER is: 
Select and explain. 
A. Gram-positive, motile, nonspore-forming, rod-shaped (coccobacilli) bacteria, B. Patients present with undulant fevers, sweating (often with characteristic foul, moldy smell sometimes likened to wet hay), and migratory ahralgia and myalgia, C. A nasopharyngeal or an oropharynx swab is sent to the bacteriology laboratory for Gram stain., D. Treated by macrolides
B: Patients present with undulant fevers, sweating (often with characteristic foul, moldy smell sometimes likened to wet hay), and migratory ahralgia and myalgia
Answer: B: Patients present with undulant fevers, sweating (often with characteristic foul, moldy smell sometimes likened to wet hay), and migratory ahralgia and myalgia 
Explanation: Malta fever Causative agent- brucella Gram-negative, non motile, non spore-forming, rod-shaped (coccobacilli) bacteria. C/F- classical triad of undulant fevers, sweating often with characteristic foul, moldy smell sometimes likened to wet hay Migratory ahralgia and myalgia LAB DIAGNOSIS:- blood culture in biphasic blood culture media(casteneda's), add erythrol improve growth D.O.C:-DOXYCYCLINE