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': 'Soldered connectors in fixed partial dentures involve the use of an intermediate metal alloy whose melting temperature is \nSelect and explain. \nA. Higher than parent metal, B. Lower than parent metal, C. Equal to parent metal, D. Unrelated to parent metal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The flow temperature of the filler metal should be at least 55.6 °C lower than the solidus temperature of the substrate metals.\nRef: Phillip’s 12th edition page 390.', 'role': 'assistant'}]