Which scientist was known for using a microscope for medical studies?

The correct answer is Dr. Nehemiah Grew, who is recognized for his pioneering work in botany and microscopy. Grew's contributions included the use of the microscope to study plant anatomy, which laid foundational work for the field of histology. His meticulous observations and detailed descriptions of plant structures represented a significant advancement in the study of biological sciences.

While other scientists listed may have made important contributions in their respective fields, Dr. Grew's specific utilization of a microscope for medical studies and his investigations into the microscopic structure of plants directly relate to the question. His work helped to further our understanding of the complexities of biological life, demonstrating the importance of microscopy in scientific research and medical studies.