This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Regarding antibiotics true are \nSelect and explain. \nA. No prophylaxis for clean contaminated surgery, B. No prophylaxis for gastric ulcer surgery, C. Prophylaxis for colorectal surgery, D. Local irrigation with antibiotic contraindicated when systemic antibiotics given', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In clean contaminated surgeries (ex : gastric) , Prophylactic antibiotics are used In contaminated surgeries , lke colorectal surgeries prophylactic antibiotics are used', 'role': 'assistant'}]