Task: Question Answering
Input (English): The ability to roll the tongue in humans is coded by the dominant allele R. The inability to roll the tongue is coded by the recessive allele r. A man with an RR allele combination for the trait produces a zygote with a woman with an rr allele combination for the trait. Which allele combination could occur in the zygote?  
 (A) R (B) rr (C) Rr (D) RR
Output (English): C