Explanation:

- Memory : Amnesia

- Memory refers to the ability to recall information.

- Amnesia is the loss of memory.

- The second term represents a loss of the first function.

- Option 1: Vision : Blindness

- Vision is the ability to see.

- Blindness is the loss of sight.

- The second term represents a loss of the first function.

- Correct Answer

- Option 2: Old age : Senility

- Old age is a stage of life.

- Senility refers to the decline of mental faculties, which can occur in old age.

- Not a direct loss relationship.

- Option 3: Audition : Hearing

- Audition is the act of hearing.

- Hearing is the process itself, not a loss.

- Option 4: Cholera : Epidemic

- Cholera is a disease.

- An epidemic is the widespread occurrence of a disease.

- Not a loss relationship.