This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Ex Input:
Around 2.5 million years ago (ending 11,600 years ago) was the geological period of the Ice Ages. Since approximately 600,000 years ago, six major Ice Ages have occurred, in which sea level dropped 120 m (390 ft) and much of the continental margins became exposed. In the Early Pleistocene, the Rhine followed a course to the northwest, through the present North Sea. During the so-called Anglian glaciation (~450,000 yr BP, marine oxygen isotope stage 12), the northern part of the present North Sea was blocked by the ice and a large lake developed, that overflowed through the English Channel. This caused the Rhine's course to be diverted through the English Channel. Since then, during glacial times, the river mouth was located offshore of Brest, France and rivers, like the Thames and the Seine, became tributaries to the Rhine. During interglacials, when sea level rose to approximately the present level, the Rhine built deltas, in what is now the Netherlands.

Ex Output:
What period was 2.5 million years ago?


Ex Input:
Certain genera of Gram-positive bacteria, such as Bacillus, Clostridium, Sporohalobacter, Anaerobacter, and Heliobacterium, can form highly resistant, dormant structures called endospores. In almost all cases, one endospore is formed and this is not a reproductive process, although Anaerobacter can make up to seven endospores in a single cell. Endospores have a central core of cytoplasm containing DNA and ribosomes surrounded by a cortex layer and protected by an impermeable and rigid coat. Dipicolinic acid is a chemical compound that composes 5% to 15% of the dry weight of bacterial spores. It is implicated as responsible for the heat resistance of the endospore.

Ex Output:
What are highly resistant dormant structures of certain gram-positive bacteria called?


Ex Input:
After the Council, Paul VI contributed in two ways to the continued growth of ecumenical dialogue. The separated brothers and sisters, as he called them, were not able to contribute to the Council as invited observers. After the Council, many of them took initiative to seek out their Catholic counterparts and the Pope in Rome, who welcomed such visits. But the Catholic Church itself recognized from the many previous ecumenical encounters, that much needed to be done within, to be an open partner for ecumenism. To those who are entrusted the highest and deepest truth and therefore, so Paul VI, believed that he had the most difficult part to communicate. Ecumenical dialogue, in the view of Paul VI, requires from a Catholic the whole person: one's entire reason, will, and heart. Paul VI, like Pius XII before him, was reluctant to give in on a lowest possible point. And yet, Paul felt compelled to admit his ardent Gospel-based desire to be everything to everybody and to help all people Being the successor of Peter, he felt the words of Christ, "Do you love me more" like a sharp knife penetrating to the marrow of his soul. These words meant to Paul VI love without limits, and they underscore the Church's fundamental approach to ecumenism.

Ex Output:

In what city did the pope encourage visits from Catholics from other countries?