Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Prostate Cancer ?
    ### Response:
    The doctor may order other exams, including ultrasound, MRI, or CT scans, to learn more about the cause of the symptoms. But to confirm the presence of cancer, doctors must perform a biopsy. During a biopsy, the doctor uses needles to remove small tissue samples from the prostate and then looks at the samples under a microscope.
    