This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Given below is a clinical feature often associated with a tumour, what is the tumour? 
Select and explain. 
A. Lung carcinoma, B. Renal cell cancer, C. Hepatocellular carcinoma, D. Colon cancer
A: Lung carcinoma
Answer: A: Lung carcinoma 
Explanation: Hyperophic osteoahropathy is encountered in 1% to 10% of patients with lung carcinoma. Rarely, other forms of cancer are involved. This disorder is characterized by(1) periosteal new bone formation, primarily at the distal ends of long bones, metatarsals, metacarpals, and proximal phalanges; (2) ahritis of the adjacent joints; and (3)clubbing of the digits.Robbins pathology 9e pg:332