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': 'Which of the following hydrocolloid is more flexible, that it can be distorted easily? \nSelect and explain. \nA. Alginate, B. Agar, C. Polysulphide, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Typical Properties of Alginate and Heavy-Bodied Agar Hydrocolloid Impression Materials:', 'role': 'assistant'}]