**Core Concept**
Typhoid ulcers are a hallmark of typhoid fever, a systemic infection caused by Salmonella Typhi. These ulcers are a result of the bacterial invasion of the intestinal mucosa, leading to inflammation and tissue damage.

**Why the Correct Answer is Right**
Typhoid ulcers typically occur in the ileum, which is the third part of the small intestine. The ulcers can cause bleeding, which is a common complication. However, stricture formation is not a typical outcome of typhoid ulcers. Stricture formation usually occurs in response to chronic inflammation or scarring, which is not a characteristic feature of typhoid ulcers.

**Why Each Wrong Option is Incorrect**
**Option A:** Ileum is indeed the common site for typhoid ulcers, as the bacteria tend to colonize this region.
**Option B:** Bleeding is a known complication of typhoid ulcers, and it can occur due to the erosion of blood vessels in the ulcerated area.
**Option D:** Perforation is a possible complication of typhoid ulcers, although it is not as common as bleeding.

**Clinical Pearl / High-Yield Fact**
Typhoid ulcers are often described as "deep and narrow" ulcers, which can help distinguish them from other types of gastrointestinal ulcers.

✓ Correct Answer: C. Stricture is usual and causes obstruction.