You can only claim the credit if you need your child to be in the pre-K program so that you can work or look for work. If you're married and filing a joint return, you and your spouse must both be working or job-hunting to claim the child-care credit.
TKD is a Targeted Ketogenic Diet. It's a modified version of the Standard Keto Diet (High fat, adequate protein, very low carb) where carbohydrates are consumed around exercise times. SKD will be fine for the vast majority of people, but if you find yourself hitting a wall in an intense workout, it can help out by giving you a bit of a glycemic 'boost' for the workout and promoting post-workout glycogen synthesis.
Polycystic kidney disease (PKD) is a systemic disorder that affects many body organs, even though it's called a kidney disease. During an ultrasound or other imaging test, doctors don't just look at the kidneys; they also look at the liver and every other organ within the abdomen. Cysts can form on the liver.