Which of the following is mismatched pair of disease and its related symptom ?

Options

A. `{:("Disease","Symptom"),("Phenylketonuria","Urine turns black on exposure to air"):}`
B. `{:("Disease","Symptom"),("Down's syndrome","Physical and mental retardation"):}`
C. `{:("Disease","Symptom"),("Klinefelter's syndrome","Sterile males"):}`
D. `{:("Disease","Symptom"),("Turner's syndrome","Sterile females"):}`

Answer

A