True or False: All autoimmune diseases are characterized by the immune system attacking the body's tissues indiscriminately, without any specific target or mechanism involved in the process.

False. In autoimmune diseases the immune system mistakenly targets specific self‑antigens, not all tissues at once. The immune attack is usually directed at a particular cell type or protein, such as insulin‑producing β‑cells in type 1 diabetes or myelin in multiple sclerosis. This focused response shows a clear mechanism, not a random indiscriminate attack. For example, in rheumatoid arthritis the immune system attacks joint cartilage and bone, sparing other organs.