What does AIDS stand for?

The correct answer is Option (1) → Acquired Immunodeficiency Syndrome

AIDS stands for Acquired Immuno Deficiency Syndrome. Each word has a meaning. ‘Acquired’ means the person gets it during his or her lifetime, so it is not a congenital (inborn) disease. ‘Immuno deficiency’ means the immune system becomes weak. ‘Syndrome’ means a group of symptoms. AIDS is caused by HIV (Human Immuno deficiency Virus).

NCERT Extract:
AIDS – “The word AIDS stands for Acquired Immuno Deficiency Syndrome. This means deficiency of immune system, acquired during the lifetime of an individual indicating that it is not a congenital disease. ‘Syndrome’ means a group of symptoms.”