<prompt> Wireless capsule endoscopy is done to visualize which of the following condition?Esophageal varicesGastric carcinomaCrohns diseaseUlcerative colitis  <response>: Crohns disease Wireless capsule endoscopy WCE allows direct visualization of the entire small-bowel mucosa. The diagnostic yield of detecting lesions suggestive of active CD is higher with WCE than CT enterography or small-bowel series. WCE cannot be used in the setting of a small-bowel stricture. Capsule retention occurs in 1 of patients with suspected CD, but retention rates of 4--6 are seen in patients with established CD. 