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': 'All are true about communicability of Malaria,except - \nSelect and explain. \nA. The number of gametocytes in blood increases with time, B. Gametocytes appear in blood 4-5 days after the appearance of the asexual parasite, in vivax infection., C. Gametocytes appear in blood 10-12 days after the appearance of asexual parasite, in falciparum infection, D. In the early stage of infection, their density may exceed 1000 per cmm of blood.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]