Detailed Instructions: 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: The intensity of operations stepped up with a move into No 11 Group of Fighter Command, being based at RAF North Weald Link Information: Fighter Command was divided into a number of Groups, each controlling a different part of the UK. 11 Group took the brunt of the German attack, as it controlled southeast England and London. It was reinforced by 10 Group, which covered southwest England, 12 Group, which covered the Midlands and East Anglia and 13 Group which covered the North of England and Scotland. Answer: 4
A:
How many groups were there in the Fighter Command?