This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'Which of the following can be reliably used for hand washing - \nSelect and explain. \nA. Chlorhexidine, B. Isopropyl alcohol, C. Glutaraldehyde, D. Cresol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Chlorhexidine (hibitane) is a relatively non toxic skin antiseptic ; most active againstgram positive organisms and fairly against gram negative ones. REF:Ananthanarayan & Panicker's Textbook of Microbiology 9th edition pg no:35", 'role': 'assistant'}]