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The correct answer is option 2: Astronomy. The Pancha Siddhantham of Varaha Mihira is a compilation of five ancient Indian astronomical texts. Varaha Mihira, an Indian astronomer and mathematician, wrote these texts to provide a comprehensive understanding of astronomy. The Pancha Siddhantham includes the Surya Siddhantham, Romaka Siddhantham, Paulisa Siddhantham, Vasistha Siddhantham, and Paitamaha Siddhantham. These texts discuss various aspects of astronomy, such as planetary movements, eclipse predictions, and celestial calculations. They also provide insights into the mathematical principles and astronomical theories of ancient India. Therefore, the Pancha Siddhantham of Varaha Mihira primarily focuses on the field of astronomy, making option 2 the correct answer.