Q: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Sentence: 'Malaria is a mosquito-borne disease caused by a parasite called Plasmodia.The disease is transmitted to people by the Anopheles mosquito. Malaria is currently a problem in tropical or subtropical areas of Asia , Africa and Central and South America .', Argument/Subject 1: 'malaria', Argument/Subject 2: 'africa'
A:
be problem in