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': 'A male 45 years old wants his missing teeth to be replaced. Intraoral examination reveals Kennedy class 4 edentulous  maxillary arch. Impression is made with alginate.\nThe strength of the material is affected by all of the following except: \nSelect and explain. \nA. Quantity of water in the mix, B. Insufficient spatulation, C. Overmixing, D. Thermal changes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Strength\nManufacturers’ directions supplied with the product should be followed in all respects. Any deviation from the instructions can have adverse effects on the gel strength. For example, if\xa0 too\xa0 much\xa0 or\xa0 too\xa0 little\xa0 water\xa0 is\xa0 used\xa0 in\xa0 mixing,\xa0 the\xa0 final\xa0 gel will be weakened, making it less elastic. Insufficient spatulation\xa0 results\xa0 in\xa0 failure\xa0 of\xa0 the\xa0 ingredients\xa0 to\xa0 dissolve\xa0 sufficiently so that the chemical reactions can proceed uniformly throughout the mass. Overmixing breaks up the formation of the calcium alginate network and reduces its strength.\nThermal changes contribute to dimensional change.\nKey Concept: Thermal changes contribute to dimensional change.\nReference: Phillips’ science of dental materials / Kenneth J. Anusavice, Chiayi Shen, H. Ralph Rawls.—12th ed. Page no 174', 'role': 'assistant'}]