This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demyelinating disorder, Subject name: Medicine
What does a score of 9 in EDSS signifies? 
Select and explain. 
A. Death of patient due to multiple sclerosis, B. Patient is bedridden, can talk, can drink, C. Patient is bedridden, can't talk, can't drink, D. Patient walks normally, shows no disability
B: Patient is bedridden, can talk, can drink
Answer: B: Patient is bedridden, can talk, can drink 
Explanation: Expanded disability severity score (EDSS)is used as measure of neurological impairment in multiple sclerosis. EDSS score: 3.5 Ambulatory Walks normally, shows no disability 9 Bedridden Can talk, Can drink 9.5 Bedridden Can't talk ,Can't drink 10 Death due to MS Revised McDonald's criteria is used in diagnosis of multiple sclerosis.