A COPD patient reports waking up at night with breathlessness three times per week. Using the MRC Dyspnea Scale, which grade best reflects this level of functional impairment?
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A
Grade 1 — only breathless with strenuous exercise
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B
Grade 2 — short of breath when hurrying on level ground
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C
Grade 3 — walks slower than contemporaries on level ground
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D
Grade 4 — stops for breath after walking about 100 yards