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: Medicine
[{'content': 'A 20 year old female presenting with anemia, mild jaundice for 2 years, peripheral smear showing sperocytes, the best investigation to be done is - \nSelect and explain. \nA. Reticulocyte count, B. Osmotic fragility test, C. Coombs test, D. Bone marrow aspiration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]