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: Radiology
Radon exposure is known to cause 
Select and explain. 
A. Carcinoma lung, B. Leukemia, C. Carcinoma colon, D. Brain tumors
A: Carcinoma lung
Answer: A: Carcinoma lung 
Explanation: ETIOLOGY OF CANCERS OF LUNG
■ Chromium,
■ Nickel, other metals
■ Tobacco smoking,
■ Ionising radiation (uranium)
■ Radon.
■ Asbestosis (May predispose to Bronchogenic carcinoma, mesothelioma, gastrointestinal cancer). Suspected Carcinogens