Do you conside a person in coma-living or dead?

Explanation

Consciousness is a defining property of all living organisms. Whereas coma is profound or deep state of unconsciousness lasting more than six hours, in which person can not be awakened, fails to respond normally to painful stimuli, light or sound.
Such person exhibit complete absence of awakefulness and unable to consciously feel, speak, hear or move. Such person is brain dead and we consider such person as living dead.