A 45 year old coal mine worker presents with cutaneous nodules, joint pain and occasional cough with dyspnea. His chest radiograph shows multiple, small nodules in bilateral lung fields. Some of the nodules show cavitation and specks of calcification. Most likely these features are diagnostic of:

1. Sjogren's syndrome
2. Caplan's syndrome
3. Silicosis
4. Wegener's granulomatosis.