This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Tumefactive lesions are seen most commonly in which disease? 
Select and explain. 
A. Reiter's disease, B. Multiple sclerosis, C. Paget disease, D. Marfan syndrome
B: Multiple sclerosis
Answer: B: Multiple sclerosis 
Explanation: Ans. B. Multiple sclerosisTumefactive multiple sclerosis is a condition in which the central nervous system of a person has multiple demyelinating lesions with atypical characteristics for those of standard multiple sclerosis (MS).It is called tumefactive as the lesions are "tumor-like" and they mimic tumors clinically, radiologically and sometimes pathologically.