In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Q: Context: In 1857, he enlisted as a private in Company K of the 7th Regiment of the New York National Guard Link Information: The regiment, located in New York City, (companies, A, B, C and D), was organized during the furore created by the firing of British at American vessels off Sandy Hook in April 1806, as the 1st, 2nd, 3rd and 4th companies. Answer: 4
A:
How many companies did Pierson's first regiment have?