Which of the following pairs is INCORRECTLY matched?

Correct option is B

Turner syndrome is not a trisomy; it is a monosomy involving loss of one X chromosome (45,X). Trisomy 13, 18, and 21 are genetic disorders caused by the presence of an extra chromosome, leading to Patau, Edward, and Down syndromes respectively. Hence, Trisomy 15 - Turner syndrome is incorrectly matched.
Explanation of options: (a) ✔ Trisomy 13 - Correctly matched with Patau syndrome. (b) ✘ Trisomy 15 - Incorrectly matched; Turner syndrome is monosomy X. (c) ✔ Trisomy 21 - Correctly matched with Down syndrome. (d) ✔ Trisomy 18 - Correctly matched with Edward syndrome.