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: Pathology
[{'content': 'In a 70-year old man who was working in asbestos factory for 10-15 years. On routine X-ray, a mass,was seen in right apical region of lung. Biopsy was taken from the mass. Which of the following is seen on electron microscopic examination? \nSelect and explain. \nA. Numerous long, slender micros ilii, B. Neurosecretary granules in the cytoplasm, C. Melanosomes, D. Desmosomes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Numerous long, slender microvilli', 'role': 'assistant'}]