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: Social & Preventive Medicine
[{'content': 'An investigator is studying a potential new antiarrhythmic. Eighty healthy test subjects are receiving various doses of the drug. Adverse effects and the drug’s pharmacokinetics are assessed \nWhich of the following steps in the drug development process does this represent? \nSelect and explain. \nA. New drug application (NDA), B. Phase I, C. Phase II, D. Phase Ill', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]