This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
All are factors of poor wound healing except - 
Select and explain. 
A. Young age, B. Infection, C. Zinc deficiency, D. Vitamin D deficiency
A: Young age
Answer: A: Young age 
Explanation: Answer- A. Young ageSystemic factorsPoor nutrition (protein deficiency, vitamin C deficiency)Metabolic abnormalities (Diabetes mellitus).Poor circulatory status (Inadequate blood supply)Hormones, e.g. glucocoicoidsB. Local factorsInfection is the single most impoant factor.Mechanical factors, e.g. early mobilization.Foreign bodies (unnecessary sutures, fragments of steel or glass).Wound in poorly vaculatized area, e.g. foot.