‘Cerebral palsy’ is a brain disorder found generally in :

The correct answer is C (Small children). Cerebral palsy is a group of permanent disorders of movement and posture caused by non-progressive damage to the developing brain, usually before, during or shortly after birth. Its signs appear in infancy and early childhood, which is why it is seen mostly in small children. The brain injury does not get worse over time, though its effects on muscle control can change as the child grows.

Why the others are wrong:

• A (Old people): Old age brings stroke, Parkinson's disease or dementia, not cerebral palsy. The damage in cerebral palsy happens early in life.
• B (Drug addicts): Substance abuse can damage the brain, but that is a different cause with different outcomes. Cerebral palsy is not linked to addiction.
• D (Only ladies): Cerebral palsy affects boys and girls alike. Some studies report slightly higher rates in boys, so the option fails on both counts.

Core concept: a congenital or perinatal neurological disorder, not a disease of age, lifestyle or sex. The Rights of Persons with Disabilities Act, 2016 recognises cerebral palsy as a disability, so it connects to the disability and inclusive education themes in Mains GS-II.

Trap: Aspirants see the word 'palsy' and associate it with old age, or assume any brain disorder must be linked to addiction. The timing of onset in the question's own wording settles it.