Answer :
a. The inability to recognize faces is called "Facial agnosia."
Facial agnosia, also known as prosopagnosia, is a neurological condition characterized by the inability to recognize familiar faces, including those of friends, family members, and even oneself, despite normal vision and intellect. People with facial agnosia may have difficulty distinguishing between faces or recalling facial features, leading to social and interpersonal challenges.
This condition can result from damage to specific areas of the brain, often associated with strokes, head injuries, or neurological disorders. Unlike facial paralysis (option c), which involves the inability to move facial muscles, facial agnosia specifically pertains to the inability to recognize faces. Options a and d, facial ataxia and facial anhedonia respectively, refer to different conditions unrelated to face recognition deficits.