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Answer:
Most likely headache.
Step-by-step explanation:
Jaundice can be seen from the yellowness from the skin, and if a person has fatigue.
Cyanosis can be seen from the bluish/greenish hue on a person's skin.
And heavy breathing can just be heard.
I'd say your answer is D) Headache.
A headache isn't really visible and can't necessarily be measured, whereas all the other answer choices are both visible and can be measured in some way, shape, or form.