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: Dental
Which of the following is a premalignant lesion of squamous cell carcinoma? 
Select and explain. 
A. Dermatofibroma, B. Granuloma annulare, C. Actinic keratosis, D. Behcet's disease
C: Actinic keratosis
Answer: C: Actinic keratosis 
Explanation: Actinic Keratosis & Bowen's disease are premalignant lesions of squamous cell carcinoma.