If a person looking at a poster sees green instead of yellow and doesn't see red at all, this person most likely has color blindness where nerves fail to respond to light properly.

The correct answer is red-sensitive nerves.

Explanation:

The individuals with protanopia do not possess the tendency to sense red light, the individuals with tritanopia do not sense blue light, and the individuals with deuteranopia do not sense green light. If an individual is perceiving green color then in that case, the yellow sensitive nerves must function somewhat efficiently as green is an amalgamation of blue and yellow. Thus, the red-sensitive nerves would not be reacting appropriately for this individual.

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