Q. Which of the following is a pair of viral diseases?
(a) Typhoid, tuberculosis
(b) Ringworm, AIDS
(c) Common Cold, AIDS
(d) Dysentery, common cold
Solution : Correct option : C Viral diseases are extremely widespread infections caused by viruses, a type of microorganism. There are many types of viruses, that cause a wide variety of viral diseases. The most common type of viral disease is the common cold, which is caused by a viral infection of the upper respiratory tract (nose and throat). The human immunodeficiency virus (HIV / AIDS) is a lentivirus (a subgroup of retrovirus) that causes the acquired immunodeficiency syndrome (AIDS), a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.