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
[{'content': 'Light radiographic film is due to: \nSelect and explain. \nA. Overdeveloping, B. Overfixing, C. Directly putting in fixer, D. Exposure to sunlight', 'role': 'user'}, {'content': "Answer: B \nExplanation: LIGHT RADIOGRAPHS\xa0\nProcessing Errors\xa0\nUnderdevelopment (temperature too low; time too short; thermometer inaccurate) Depleted developer solution\xa0\nDiluted or contaminated developer\xa0\nExcessive fixation\xa0\nUnderexposure\xa0\nInsufficient mA\xa0\nInsufficient kVp\xa0\nInsufficient time\xa0\nFilm-source distance too great\xa0\nFilm packet reversed in mouth\xa0\nDARK RADIOGRAPHS\nProcessing Errors\xa0\nOverdevelopment (temperature too high; time too long)\xa0\nDeveloper concentration too high\xa0\nInadequate time in fixer\nAccidental exposure to light\xa0\nImproper safelighting\xa0\nStorage of films without shielding, at too high a temperature, or past expiration date\nReference: White and Pharoah's Oral Radiology Principles and Interpretation 7th edition page no 80", 'role': 'assistant'}]