Which of the following diseases is a chronic disease?

Fever and cough last for a small duration and hence, they are acute. On the contrary, elephantiasis is a chronic disease, which lasts for a long time and makes the body and general health poor. In this disease, the person’s limbs, i.e. feet, legs, arms and hands, are highly swollen due to accumulation of water in the cells. The person looks bulky and his limbs are swollen. Hence, it is compared to elephant’s limbs and so the disease is termed “elephantiasis”. It should be noted that now small pox has been eradicated, but when it was prevalent, it used to last for a small time and cause death.