Pediatrics In a patient, muscle cramps on exercise, +ve myoglobulinemia, the disorder is – A Pompe's disease B Myotonia congenita C Myotonic dystrophy D Mc ardle's disease 💡 Explanation In a patient, muscle cramps on exercise, +ve myoglobulinemia, the disorder is - ✓ Correct Answer: D. Mc ardle's disease