Task: Question Answering
Input (English): Problem: the average score in an examination of 10 students of a class is 60 . if the scores of the top 5 students are not considered , the average score of the remaining students falls by 5 . the pass mark was 40 and the maximum mark was 100 . it is also known that none of the students failed . if each of the top 5 scorers had distinct integral scores , the maximum possible score of the topper is . . . . . . 
Options: a ) 99 , b ) 100 , c ) 87 , d ) 95 , e ) 90
Output (English): a