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