A) Myasthenia gravis — Auto-immune disorder (IV): This condition causes muscle weakness due to antibodies affecting neuromuscular junctions. B) Muscular dystrophy — Progressive muscle degeneration (III): It involves progressive weakening and loss of muscle mass. C) Gout — Urate crystal deposits in joints (I): Caused by elevated uric acid leading to joint inflammation. D) Osteoporosis — Low bone density, fractures (II): Characterized by fragile bones and increased fracture risk.