<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 56-year old man is brought in by ambulance to the emergency department and presents with altered consciousness, confabulation, and widespread rash. He is recognized as a homeless man that lives in the area with a past medical history is significant for traumatic brain injury 4 years ago and chronic gastritis. He also has a long history of alcohol abuse. His vital signs are as follows: blood pressure 14085 mm Hg, heart rate 101min, respiratory rate 15min, and temperature 36.1C 97.0F. His weight is 56 kg 123.5 lb and height is 178 cm 5.8 ft. The patient is lethargic and his speech is incoherent. Examination reveals gingival bleeding, scattered corkscrew body hair, bruises over the forearms and abdomen, multiple petechiae, and perifollicular, hyperkeratotic papules over his extremities. His lung and heart sounds are normal. Abdominal palpation reveals tenderness over the epigastric area and hepatomegaly. Neurologic examination demonstrates symmetrically diminished reflexes in the lower extremities. Impairment of which of the following processes is the most likely cause of this patients hyperkeratotic rash?? A: Hydroxylation of proline residues, B: Carboxylation of clotting factors, C: Decarboxylation of histidine, D: Deamination of guanine, E: Ethanol oxidation to acetaldehyde,  <response>: Based on the patients presentation of altered consciousness, confabulation, widespread rash, corkscrew body hair, petechiae, and hyperkeratotic papules, the most likely diagnosis is vitamin C deficiency scurvy. The rash and corkscrew hairs are characteristic of scurvy. Vitamin C is required for collagen synthesis, and deficiency leads to weakened blood vessel walls, causing the petechiae and bruising. The likely cause in this homeless patient with alcoholism is poor nutrition. Vitamin C is required for the hydroxylation of proline residues in collagen. Therefore, impairment of proline hydroxylation is most likely causing the hyperkeratotic skin rash in this patient.A: Hydroxylation of proline residues 