This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
All of the following are pre-cancerous conditions of the lids except 
Select and explain. 
A. Solar keratosis, B. Naevus, C. Xeroderma pigmentosa, D. Carcinoma-in-situ
B: Naevus
Answer: B: Naevus 
Explanation: TUMOURS OF THE LIDS Classification : 1. Benign tumours: These include; simple papilloma, naevus, angioma, haemangioma, neurofibroma and sebaceous adenoma. 2. Pre-cancerous conditions: These are solar keratosis, carcinoma-in-situ and xeroderma pigmentosa. 3. Malignant tumours: Commonly observed tumours include squamous cell carcinoma, basal cell carcinoma, malignant melanoma, and sebaceous gland adenocarcinoma. Ref:- A K KHURANA; pg num:-359