'Braille' is a system designed for people with 'Blindness' to read using touch. In the same way, 'Sign language' is a system primarily designed for which condition?

Introduction / Context:
This analogy pairs assistive communication systems with the conditions they address. Braille enables literacy for people who are blind via tactile dots. Sign languages enable communication predominantly for people who are deaf or hard of hearing through visual-gestural modalities.

Given Data / Assumptions:

• Braille ↔ blindness (tactile reading/writing).
• Sign language ↔ deafness (visual-manual communication).

Concept / Approach:
We match the designed-for relationship. The function of sign language directly supports those with hearing impairments by replacing auditory speech with visual signing and facial/hand cues.

Step-by-Step Solution:

Verification / Alternative check:
“Touch” is a sensory modality, not a condition. “Exceptional”/“Presentation” are irrelevant here. “Aphasia” is a language impairment distinct from hearing loss; sign language is used by many deaf communities as a primary language.

Why Other Options Are Wrong:

• Exceptional / Presentation: Not conditions addressed by a communication language.
• Touch: A sense, not the target condition.
• Aphasia: Different impairment; sign language is not uniquely for aphasia.

Common Pitfalls:
Confusing the modality of use (touch, vision) with the user group/condition addressed (blindness, deafness).

Final Answer:
Deafness