Final answer:
Galactosemia (option A) is the likely cause of the symptoms described in the question, including jaundice, bilateral lens opacification (cataracts), vomiting, diarrhea, and poor weight gain in a neonate.
Step-by-step explanation:
The symptoms described in the question, including jaundice, bilateral lens opacification (cataracts), vomiting, diarrhea, and poor weight gain in a neonate, are characteristic of Galactosemia (option A).
Galactosemia is a rare genetic disorder that impairs the body's ability to process galactose, a type of sugar found in milk and other dairy products. Infants with galactosemia cannot properly metabolize galactose, leading to the accumulation of toxic substances in their bodies.
As a result, they may experience symptoms such as jaundice, cataracts, vomiting, diarrhea, and failure to thrive.