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: Dental
[{'content': 'Setting time of alginate is best regulated by the: \nSelect and explain. \nA. Amount of retarder added during the manufacturing process, B. Changing the temperature of mixing water, C. Modification in the W/P ratio, D. Speed of mixing or mixing time', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Though setting time of alginate can be changed or regulated by any of the above method, but most of\xa0them leads to changes or aﬀect the properties of ﬁnal set alginate. Only available best method to\xa0regulate it is by a speciﬁc amount of retarder added during the manufacturing process.\nAlso know\n\nSetting time of Fast-setting alginate = 1.5 to 3 min\nSetting time of Normal-setting alginate = 3 to 4.5 min', 'role': 'assistant'}]