A, B, and C are all correct. The Aztecs believed the Spanish were fulfilling a prophecy from one of their gods (I forget which, but the god had light skin and would return from over the sea) and they welcomed them with gifts. The Spanish were carriers of small pox, which the Aztecs had no natural defense against.
My tables can be broken in half to make a 50 mg dose, which I have also used. I'd guess your 50 mg toprol xl can be split in half to give you a 25 mg tablet. I'm not suggesting what dose you should use, just saying I think you have a way to take 25 mg accurately if that's what is needed. I take the med to slow down my HR, driven by AFig.
Low blood sugar levels have been reported in people taking such drugs. Normal doses of metoprolol probably do not significantly increase the risk of low blood sugar for most people. However, Toprol-XL can make low blood sugar less noticeable (which can be dangerous, especially for people with diabetes). This potential side effect of beta blockers is more common in infants and children, while fasting (such as before surgery), after prolonged exercise, or in people with kidney disease or diabetes.