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General Medicine General 8e6d7773

A 9 yr old girl has difficulty in combing hairs and climbing upstairs since 6 months. She has Gower's sign positive and maculopapular rash over metacarphalangeal joints. What should be the next appropriate investigation to be done?

A
ESR
B
RA factor
C
Creatine kinase
D
Electromyography

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