This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Effect of radiation above threshold level - \nSelect and explain. \nA. Stochastic effect, B. Non-Stochastic effect, C. Lethal effect, D. Genetic effect', 'role': 'user'}, {'content': "Answer: B \nExplanation: park's textbook of preventive and social medicine 23rd edition *effect of radiation exposure are called somatic if they become manifest in the exposed individual and hereditary if they the descandants . *for some somatic effects ,the propability of an occurring ,rather than its severity ,is regarded as a function of dose without a theshold (stochatic effect).where as for other somatic effects the severity vary with doses (non-stochastic effect ):a threshold may therefore exist for such effects .", 'role': 'assistant'}]