Okay, let's tackle this question about Androgen Insensitivity Syndrome (AIS). First, I need to remember the key points about AIS. It's a condition where the body can't respond to androgens properly because of mutations in the androgen receptor gene. That's on the X chromosome, so it's X-linked recessive.

The question asks which statements are true. Since the options aren't provided, I'll have to think about common facts related to AIS. Let's recall: AIS affects males (XY) because they have only one X. The androgen receptor is crucial for developing male characteristics. If there's a mutation, the body can't respond to testosterone, leading to varying degrees of feminization.

Complete AIS would result in a female phenotype despite having testes. The testes are internal, and the person might be raised as a female. They don't have a uterus or ovaries. In Partial AIS, there might be ambiguous genitalia. Testosterone levels are normal or elevated because the testes are producing it, but the body can't use it. So lab results would show normal testosterone but low or undetectable dihydrotestosterone (DHT), since the receptor isn't working.

Now, considering possible wrong options, maybe someone might confuse AIS with Klinefelter's syndrome (XXY), which is different. Or maybe someone might think it's autosomal dominant, but it's X-linked recessive. Another common mistake is thinking the SRY gene is involved, but that's for testis determination. The androgen receptor gene is on the X. Also, people with AIS have testes, not ovaries, so any option suggesting they have ovaries is wrong.

Clinical pearls: Remember that in AIS, the gonads are testes, and the karyotype is 46,XY. The condition is due to androgen receptor dysfunction, not a lack of androgens. So, when you see a male with female external genitalia, consider AIS. The key is the non-responsiveness to androgens.

Putting this all together, the correct answer would highlight that AIS is X-linked recessive, involves androgen receptor mutations, leads to testes but female phenotype in complete cases, and the presence of testes despite female appearance. The wrong options would be things like autosomal inheritance, presence of ovaries, or incorrect karyotypes. The clinical pearl is to remember the X-linked inheritance and the role of the androgen receptor.

**Core Concept**
Androgen insensitivity syndrome (AIS) is an X-linked recessive disorder caused by mutations in the *androgen receptor (AR)* gene. It leads to impaired response to androgens, resulting in variable phenotypes from mild to complete female external genitalia despite a 46,XY karyotype and testes.

**Why the Correct Answer is Right**
AIS occurs due to dysfunctional androgen receptors, preventing testosterone and dihydrotestosterone (DHT) from exerting their effects. In complete AIS, testes produce testosterone, but the body cannot utilize it, leading to female external genitalia and absence of secondary sexual characteristics. The testes remain undescended (internal) and produce anti-Müllerian hormone (AMH), preventing uterus development. Diagnosis relies on karyotype (46,XY), elevated testosterone, and absent DHT effects.

**Why Each

✓ Correct Answer: B. Scanty pubic hair