This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Arsenic is assocaited with increased risk of   a) Mesothelioma   b) Melanoma     c) Basal cell carcinoma  d) Squamous cell carcinoma 
Select and explain. 
A. ad, B. bd, C. cd, D. ab
C: cd
Answer: C: cd 
Explanation: None