**Core Concept**
Sexual ambiguity refers to a condition where an individual's physical characteristics do not clearly align with typical male or female morphology. This can be due to various genetic, hormonal, or anatomical factors.

**Why the Correct Answer is Right**
Sexual ambiguity can be seen in congenital adrenal hyperplasia (CAH), a group of inherited disorders resulting from the deficiency of enzymes involved in cortisol production, specifically 21-hydroxylase. The lack of cortisol production leads to an overproduction of androgens, which can cause virilization of female genitalia and ambiguous genitalia in affected individuals. The resulting hormonal imbalance disrupts the normal development of the reproductive system.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because Turner syndrome is characterized by a complete or partial absence of one X chromosome, leading to short stature, ovarian dysgenesis, and other physical features, but it does not typically result in sexual ambiguity.

**Option B:** This is incorrect because Klinefelter syndrome is a genetic condition where males have an extra X chromosome, leading to hypogonadism and infertility, but it does not typically result in sexual ambiguity.

**Option C:** This is incorrect because Androgen insensitivity syndrome (AIS) is a condition where individuals have a Y chromosome and produce androgens, but they are resistant to the effects of androgens, leading to a female phenotype. While individuals with AIS may have ambiguous genitalia at birth, the condition itself does not result in sexual ambiguity.

**Clinical Pearl / High-Yield Fact**
It's essential to note that sexual ambiguity can have significant emotional and psychological implications for affected individuals, emphasizing the importance of early diagnosis and appropriate management.

**Correct Answer: C. Androgen insensitivity syndrome**