Vitamin B3 is a precursor for NAD+. Back in the early 1900's those living in orphanages and prisons were fed a corn-heavy diet. Absent the process of nixtamalization, vitamin B3 is poorly released from corn and individuals on this diet develop a condition called pellagra. Which of the following metabolic steps would be directly affected in those individuals with pellagra?

answer; polycythemia is the correct answer;

it is either c or d and i know for sure it is not a or b

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .