Read the following passage and answer the question.
"Officers responding to a domestic dispute shall first attempt to separate the parties involved. If either party appears injured, medical assistance must be requested immediately. Officers shall document all visible injuries with photographs and written descriptions before either party is transported. Statements from all parties and witnesses present shall be collected separately to prevent contamination of accounts."
According to the passage, when must medical assistance be requested?
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A
After all statements have been collected
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B
If either party appears injured
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C
Only if both parties are injured
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D
Before separating the parties