What do they mean by "going ’cold vegan turkey’"

A. There is yet no scientific consensus on the questions about "probiotic" products.< br>B. Antibiotics are not very selective as to which bacteria they attack.< br>C. It is impossible to know how many live bacteria will be preserved in the digestive system.< br>D. It is not always easy to measure to what extent probiotic products can outrun potentially unfriendly microbes.

A. Cuckoos usually lay eggs with similar shape and color in other birds’ nest.< br>B. Cuckoo chicks can get rid of the host birds’ chicks.< br>C. Cuckoo chicks can get rid of the host birds’ eggs before they hatch out.< br>D. Cuckoo chicks mimic the appearance of the host birds’ chicks.