Under which of the following conditions is a person most likely to fall sick?
(a) when she is recovering from malaria.
(b) when she has recovered from malaria and is taking care of someone suffering from chicken-pox.
(c) when she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox. Why?

Explanation

Malaria is a very serious fatal disease. It is caused by the toxins produced in the human body by malarial parasite Plasmodium which is carried from the infected person to the healthy persons by the bite of the femal Anopheles mosquito. Malaria results anaemia, enlargement of liver and spleen.
The possible reason of falling sick of lady is that she has recently suffered from malaria and her body's organ systems are still not functionig normally. Moreover, she is on four days fast which has made her body weak due to improper supply of food. So she is more prone to infections. Above all, shee is taking care of someone who is suffering from most fearful infectious viral disease i.e. chicken pox, she has more chances of getting an infection due to above mentioned regions.