Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Min and Bill is a 1930 American Pre-Code comedy-drama film starring Marie Dressler and Wallace Beery and based on Lorna Moon's novel Dark Star, adapted by Frances Marion and Marion Jackson. 
Answer : Lorna Moon
Which is the basis of Min and Bill?

Context : Mainova AG was formed in 1998 through the merger of Stadtwerke Frankfurt am Main GmbH and Maingas AG. 
Answer : Stadtwerke Frankfurt
What is Mainova's parent company?

Context : Mavis Villiers died from pneumonia at her Paddington flat in 1976, aged 65. 
Answer : pneumonia

What was the cause of Mavis Villiers's death?