You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.

Powdered sugar, also called confectioners' sugar, icing sugar, and icing cake, is a finely ground sugar produced by milling granulated sugar into a powdered state. It usually contains a small amount of anti-caking agent to prevent clumping and improve flow. Although most often produced in a factory, powdered sugar can also be made by processing ordinary granulated sugar in a coffee grinder, or by crushing it by hand in a mortar and pestle.
Solution: is confectionary sugar the same as powdered sugar?
Why? The question is a yes/no question, and it is answerable based on the given passage.

New input: Frank Williams (born 2 July 1931) is an English actor best known for playing Timothy Farthing, the vicar in the BBC comedy Dad's Army. He and Ian Lavender are the last surviving major cast members. He reprised the role of Farthing in the 2016 film adaptation of the series.
Solution:
are there any actors still alive from dad's army?