I want to know the answer to the following question:
What was the title of Deep Purple's hard rock 1970 album?
All the background I'm provided with is that "Led Zeppelin (1969) and Led Zeppelin II (1969), and Deep Purple, who began as a progressive rock group but achieved their commercial breakthrough with their fourth and distinctively heavier album, In Rock (1970).". Is that enough to answer the question?
Answer: yes