Then the next day we went to a local church for service and i had diarrhoea a few times due to having the malaria tablet before food . Anyway , i met 2 Singaporean ladies there and they were teaching bible in Dili . One of them told me that they just felt called to go to Timor , not knowing the place at all and they stayed at the mountain at first for few months . with the support from their own church , they moved to the city , Dili , to start to learn the native language and teach bible to the locals .

Question: What may be the reason for the Malaria pills giving them diarrhea ?
Answer: None of the above choices .The pills themselves make people sick .They drank the water in a foreign country .They did n't take it with food .