user: Can you tell me about Hyderabad, India?

assistant: <think>
Hyderabad (/ˈhaɪdərəbæd/ (listen) HY-dər-ə-bad; Telugu: [ˈɦaɪ̯daraːbaːd], Urdu: [ˈɦɛːdəɾaːbaːd]) is the capital and largest city of the Indian state of Telangana and the de jure capital of Andhra Pradesh.[A] It occupies 650 km2 (250 sq mi) on the Deccan Plateau along the banks of the Musi River, in the northern part of Southern India. With an average altitude of 542 m (1,778 ft), much of Hyderabad is situated on hilly terrain around artificial lakes, including the Hussain Sagar lake, predating the city's founding, in the north of the city centre. According to the 2011 Census of India, Hyderabad is the fourth-most populous city in India with a population of 6.9 million residents within the city limits, and has a population of 9.7 million residents in the metropolitan region, making it the sixth-most populous metropolitan area in India. With an output of US$74 billion, Hyderabad has the fifth-largest urban economy in India.

Muhammad Quli Qutb Shah established Hyderabad in 1591 to extend the capital beyond the fortified Golconda. In 1687, the city was annexed by the Mughals. In 1724, Asaf Jah I, the Mughal viceroy, declared his sovereignty and founded the Asaf Jahi dynasty, also known as the Nizams. Hyderabad served as the imperial capital of the Asaf Jahi's from 1769 to 1948. As capital of the princely state of Hyderabad, the city housed the British Residency and cantonment until Indian independence in 1947. Hyderabad was annexed by the Indian Union in 1948 and continued as a capital of Hyderabad State from 1948 to 1956. After the introduction of the States Reorganisation Act of 1956, Hyderabad was made the capital of the newly formed Andhra Pradesh. In 2014, Andhra Pradesh was split to form the state of Telangana, and Hyderabad became the joint capital of the two states with a transitional arrangement scheduled to end in 2024. Since 1956, the city has housed the Rashtrapati Nilayam, the winter office of the president of India.</think>
Hyderabad is the capital of Telangana, which is a southern state of India. Hyderabad is also known as Bhagyanagar which is well known for it's cuisine primarily the Hyderbadi Biryani and also known as Pearl city. Hyderabad was built about 450 years ago and keeps growing, currently it's spread 250 sq miles in Deccan Plateau. Hyderabad is house for many cultures and people from all over the world. Hyderabad has great scenic places like Charminar, Golconda Fort, Bhagyalaxmi Temple, Ramoji FilmCity and Birla Temple to name a few.

user: Why is the Cave of the Crystals or Giant Crystal Cave closed to the public?

assistant: <think>
Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los cristales) is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. It takes the form of a chamber within the limestone host rock of the mine, and is about 109-metre (358 ft) long with a volume of 5,000 to 6,000 cubic metres (180,000 to 210,000 cu ft).

The chamber contains giant selenite crystals (gypsum, CaSO4 · 2 H2O), some of the largest natural crystals ever found. The largest is 11.40 metres (37.4 ft), with a volume of about 5 cubic metres (180 cu ft), and an estimated mass of 12 tonnes. When not flooded, the cave is extremely hot, with air temperatures reaching up to 58 °C (136 °F) with 90 to 99 percent humidity. This is comparable to temperature records in Death Valley, but with much wetter air. The cave is relatively unexplored because of these factors. Without proper protection, people can only endure approximately ten minutes of exposure at a time.

The cave was discovered in April 2000 by brothers Juan and Pedro Sánchez while drilling in the mine. As of October 2015, the mine had reflooded and the cavern filled once more with the water rich in minerals required for the crystals to grow.

A group of scientists in the Naica Project have been studying these caverns.</think>
The conditions in the cave are not hospitable, extreme heat and humidity, sharp slippery crystals are lethal for humans.

user: What are the four major tournaments in professional golf?

assistant: The four major tournaments in professional golf are the Masters, PGA Championship, Open Championship, and U.S. Open.