This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Which of the following is not required for wound healing \nSelect and explain. \nA. Zinc, B. Calcium, C. Copper, D. Vitamin C', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nutritional status has profound effects on repair; protein deficiency, for example, and paicularly vitamin C deficiency, inhibits collagen synthesis and retards healing zinc is a cofactor in collagenase so zn deficiency impairs wound healing ref robbins 9th ed page 106', 'role': 'assistant'}]