What is a cystoscope primarily used for?

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A cystoscope is primarily used to investigate the bladder. This instrument is specifically designed for the examination of the urinary tract, especially the bladder and the urethra. During a cystoscopy, a healthcare provider can directly visualize the interior of the bladder and diagnose conditions such as infections, bladder stones, tumors, or other abnormalities. This procedure is essential for urologists in both diagnosing and treating various urinary issues.

Contextually, the other options refer to areas of the body that do not involve the bladder. The throat involves procedures like laryngoscopy, which is unrelated to cystoscopy. Similarly, the intestines would be examined using an endoscope or colonoscope, not a cystoscope, and the lungs would require tools such as a bronchoscope for evaluation. Hence, the primary focus of a cystoscope is accurately on the bladder, making this the correct answer.