Teacher: This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Passage: The outbreak of the Seven Years' War in Europe in 1756 resulted in renewed conflict between French and British forces in India. The Third Carnatic War spread beyond southern India and into Bengal where British forces captured the French settlement of Chandernagore in 1757. However, the war was decided in the south, where the British successfully defended Madras, and Sir Eyre Coote decisively defeated the French, commanded by Comte de Lally at the Battle of Wandiwash in 1760. After Wandiwash, the French capital of Pondicherry fell to the British in 1761. The war concluded with the signing of the Treaty of Paris in 1763, which returned Chandernagore and Pondichery to France, and allowed the French to have "factories" in India but forbade French traders from administering them. The French agreed to support British client governments, thus ending French ambitions of an Indian empire and making the British the dominant foreign power in India.
Question: Which french settlement did the British capture first, Chandernagore or Pondicherry
Answer type: Span
Solution: Chandernagore
Reason: British captured Chandernagore in 1757 ("The Third Carnatic War spread beyond southern India and into Bengal where British forces captured the French settlement of Chandernagore in 1757") and Pondicherry in 1761 ("After Wandiwash, the French capital of Pondicherry fell to the British in 1761."). Since 1757<1761, the answer is "Chandernagore".

Now, solve this instance: Passage: The 11-week Conference of Lausanne was held in Lausanne, Switzerland, during 1922 and 1923. Its purpose was the negotiation of a treaty to replace the Treaty of Sevres, which, under the new government of the Grand National Assembly, was no longer recognised by Turkey. The conference opened in November 1922, with representatives from the United Kingdom, France, Italy and Turkey. It heard speeches from Benito Mussolini of Italy and Raymond Poincare of France. At its conclusion, Turkey assented to the political clauses and the "freedom of the straits", which was Britain's main concern. The matter of the status of Mosul was deferred, since Curzon refused to be budged on the British position that the area was part of Iraq. The British Iraq Mandate's possession of Mosul was confirmed by a League of Nations brokered agreement between Turkey and Great Britain in 1926. The French delegation, however, did not achieve any of their goals and on 30 January 1923 issued a statement that they did not consider the draft treaty to be any more than a "basis of discussion". The Turks therefore refused to sign the treaty. On 4 February 1923, Curzon made a final appeal to Ismet Pasha to sign, and when he refused the Foreign Secretary broke off negotiations and left that night on the Orient Express.
Question: How many countries opened the Conference of Lausanne?
Answer type: Number
Student:
4.