Well its answer is B i.e. “Depletion of Ozone layer”. A cataract is generally an eye’s lens clouding, which can damage vision. Cataracts take place when protein buildup in the lens and makes it cloudy. Eyelid skin cancers include basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). If you are facing trouble then learn about skin cancer diagnosis here http://www.eskinstore.com/forum/topic.asp?TOPIC_ID=1348
and look for its effective treatment.