Problem: David is a doctor with the local hospital. Yesterday, he was seeing two patients, patient A and patient B. His tests found out that patient A had myopia, but patient B had normal eyesight. He referred the patient with eye condition to an ophthalmologist. Who would most likely have diabetes or visual stress, patient A or patient B?

A: patient A

Problem: John wanted to know what makes a lake different from a pond. To that end, he first visited a lake. He labeled that part of the study as case A. Then he visited a pond. He labeled that part of the study as case B. John realized that though both of them were water-bodies, they were very different. Which water-body would be shallower, case A or case B?

A: case B

Problem: Keith is a zoologist. He studies large predators. Last year, he was studying different species of lions. First, he visited the Gir forest in India. There he found the Asiatic Lions. Unfortunately, only few Asiatic Lions are left in the wild, and they have to mate with their close relatives. He then visited the Serengeti reserve in Tanzania. There he found that the African Lions were not forced to mate with close relatives due to their large number. Which place would see more inbreeding depression, Gir or Serengeti?

A: Gir

Problem: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not. Which group of mice had more random errors in genes?

A:
Group C