Biotin (below), also known as Vitamin B7, is a very large organic compound derived primarily from meats, eggs, nuts, and certain vegetables. The pKa of biotin is 4.4. This means that biotin is/is not soluble at the pH of stomach acid (pH ~2.5) and is/is not soluble at the pH of duodenum (pH ~6.1). a   is soluble in stomach and duodenum b   is soluble in stomach but not duodenum c   is not soluble in either stomach or duodenum d   is not soluble in stomach but is soluble in duodenum

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