What should come in place of the question mark (?) in the given series?

800, 789, 767, 734, 690, 635,  ?​​​

800, 789, 767, 734, 690, 635, ?​​

Logic: The numbers are decreasing by multiples of 11: ​−11, −22, −33, −44, −55

Let's analyze the series:

800 − 11 = 789

789 − 22 = 767

767 − 33 = 734

734 − 44 = 690

690 − 55 = 635

So, the missing number is: 569

Thus, the correct option is: (a)