Generate a correct and concise answer for the question based on the words in the context.

[Q]: Context : The Roviana rail (Gallirallus rovianae) is a species of bird in the family Rallidae. 
Question : Is the taxon rank of Roviana rail species or genus?
[A]: species


[Q]: Context : Rappadikalude Gatha (English: The Journey of the Nightingales) is a 1978 Malayalam film written by Padmarajan, directed by K. G. George and starring Vidhubala in the lead role. 
Question : Who was the star of Rappadikalude Gatha?
[A]: Vidhubala


[Q]: Context : Margarethe von der Saale (1522 -- 6 July 1566), was a German lady in waiting and noble, morganatic spouse by bigamy to Philip I, Landgrave of Hesse. 
Question : What is Margarethe von der Saale's spouse's name?
[A]:
Philip I, Landgrave of Hesse