Question: Two twin sisters were taken to the doctor's office by their parents. It turned out that Mary had hemophilia while Ann didn't have any blood disease. Which sister was more exposed to the risk of bleeding to death?
Answer: Mary

Question: Last week, John visited the national park near his city. He saw many flowers. His guide explained him that there are two categories of flowers, category A and category B. Category A flowers spread pollen via wind, and category B flowers spread pollen via animals. Would category B flower have more or less colorful petals than category A flower?
Answer: more

Question: Doctors studied two groups of patients. Group W which had people with sickle cell disease, and group A which had normal people in it. Which group had fewer individuals with a specific mutation in the primary sequence of their hemoglobin molecules?
Answer:
group A