Statement: This book ‘Z’ is the only book which focuses its attention to the problem of poverty in India between 1950 and 1980.
Conclusions:
I. There was no question of poverty before 1950.
II. No other book deals with poverty in India during 1950 to 1980.
If only conclusion II follows
The phrase 'only book' in the statement makes II implicit. However, nothing about the state of poverty before 1950 can be deduced from the statement. So, I does not follow.