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
Which of the following is a late complication of radiotherapy - 
Select and explain. 
A. Nausea, B. Erythema, C. Thrombocytopenia, D. Radiation pneumonitis
D: Radiation pneumonitis
Answer: D: Radiation pneumonitis 
Explanation: Ans. is'd'i.e., Radiation pneumonitis[Ref Cancer in Children: Clinical Management p. 132Radiation pneumonitis is a late complication.Late effects : - Appearance within a few to many years : -Pericardial involvement is the most common and includes asymptomatic pericardial effusion & constrictive pericarditis.Radiation pneumonitisPost radiation transverse myelitis develop after 12-24 months.Leukemia is the most common radiation induced cancer.Other cancers are thyroid and breast carcinoma.Papillary carcinoma of the thyroid may develop due to radiation exposure in infancy.Gliomas, Meningiomas, Sarcomas, Lung cancer