Okay, let's tackle this question. The user is asking which of the options is not X-linked. First, I need to recall common X-linked disorders. X-linked conditions are typically recessive in males because they have only one X chromosome. Examples include hemophilia A and B, Duchenne muscular dystrophy, and color blindness.

Wait, the question is about which is NOT X-linked. So the correct answer would be a condition that follows a different inheritance pattern. Let me think of some genetic disorders that are not X-linked. Cystic fibrosis is an autosomal recessive disorder. Sickle cell anemia is also autosomal recessive. Huntington's disease is autosomal dominant.

If the options include these, then the answer would be one of them. Let's say the options are A: Hemophilia A, B: Duchenne muscular dystrophy, C: Cystic fibrosis, D: Color blindness. In this case, C is the correct answer because it's autosomal recessive.

I need to make sure that the other options are indeed X-linked. Hemophilia is definitely X-linked recessive. Duchenne is X-linked recessive as well. Color blindness is X-linked recessive too. So if the options are those, then the answer is C.

Now, for the explanation. Core concept: X-linked inheritance affects males more because they have only one X. The correct answer is cystic fibrosis, which is autosomal. The other options are X-linked. Each wrong option explanation needs to clarify their X-linked nature. Clinical pearl: Remember that X-linked disorders show crisscross inheritance and are more common in males. Correct answer is C.

**Core Concept:** X-linked genetic disorders are inherited via the X chromosome, typically affecting males more severely due to hemizygosity. Autosomal disorders, in contrast, involve non-sex chromosomes and follow different inheritance patterns (e.g., recessive, dominant).

**Why the Correct Answer is Right:** Cystic fibrosis (CF) is an **autosomal recessive** disorder caused by mutations in the **CFTR gene** on chromosome 7. It does not follow X-linked inheritance, making it the correct answer. CFTR dysfunction leads to thick mucus production, primarily affecting the lungs and pancreas.

**Why Each Wrong Option is Incorrect:**
**Option A:** Hemophilia A is X-linked recessive, caused by **factor VIII deficiency**.
**Option B:** Duchenne muscular dystrophy is X-linked recessive, due to **dystrophin gene mutations**.
**Option D:** Red-green color blindness is X-linked recessive, linked to **OPN1LW/OPN1MW gene mutations**.

**Clinical Pearl / High-Yield Fact:** X-linked recessive disorders show "crisscross inheritance" (mother to son), while autosomal recessive disorders like CF require both alleles to be mutated, often seen in consanguineous families. Always associate CF with **chromosome 7**, not the X chromosome.

**Correct Answer: C. Cystic fibrosis**

✓ Correct Answer: C. Von - willebrand's disease