The correct answer is option B, sores that do not heal
Reason -
If someone is having a non-healing sore then they must consult the doctor , as there are high probabilities that this person might be having cancer. Generally the sores heal quickly and in case if there persists a sore which is not healing since a long time along with persistent red or white patches in and around the sore, it is advisable to consult a doctor. In some cases, these sores may have arisen due to poor air circulation but it would be advisable to consult a doctor anyhow.
Options a, d, c, and e all contains amino acids units. They are therefore made up of protein structure. cholesterol contains alcohol and steroids. it belongs to the steroid lipid family unlike other options that belong to protein family.