Title: Constituent Assembly of India
Content:  The Constituent Assembly of India was elected to frame the Constitution of India. It was elected by the 'Provincial Assembly'. Following India's independence from British Government in 1947, its members served as the nation's first Parliament. An idea for a Constituent Assembly was proposed in 1934 by M. N. Roy, a pioneer of the Communist movement in India and an advocate of radical democracy. It became an official demand of the Indian National Congress in 1935,The Indian National Congress held its session at Lucknow on April 1936 presided by Pt. Jawahar Lal Nehru. The official demand for Constituent Assembly was raised and Government of India Act, 1935 was rejected as it imposed the Constitution which was against the will 
Title: Constitution of India
Content: 6 December 1946: Formation of the Constitution Assembly (in accordance with French practice). ; 9 December 1946: The first meeting was held in the constitution hall (now the Central Hall of Parliament House).  The 1st person to address was J. B. Kripalani, Sachchidananda Sinha became temporary president.  (Demanding a separate state, the Muslim League boycotted the meeting.) ; 11 December 1946: The Assembly appointed Rajendra Prasad as its president, H. C. Mukherjee as its vice-chairman and B. N. Rau as constitutional legal adviser. (There were initially 389 members in total, which declined to 299 after partition. Out of the 389 members, 292 were from government provinces, 
Title: Constituent Assembly of India
Content:  The Constituent Assembly of India, consisting of indirectly elected representatives, was established to draft a constitution for India (including the now-separate countries of Pakistan and Bangladesh). It existed for approx. three years, the first parliament of India after independence in 1947. The Assembly was not elected on the basis of universal adult suffrage, and Muslims and Sikhs received special representation as minorities. The Muslim League boycotted the Assembly after failing to prevent its creation. Although a large part of the Constituent Assembly was drawn from the Congress Party in a one-party environment, the Congress Party included a wide diversity of opinions—from conservative industrialists to radical Marxists, to Hindu revivalists. The Assembly met for the first time in New Delhi on 9 December 1946, and its last session was held on 24 January 1950. The hope of the Assembly was expressed by Jawaharlal Nehru: "The first task 
Title: Constituent assembly
Content:  The Constituent Assembly of India was elected to write the Constitution of India, and served as its first Parliament as an independent nation. It was set up as a result of negotiations between the leaders of the Indian independence movement and members of the British Cabinet Mission. The constituent assembly was elected indirectly by the members of the Provincial legislative assembly, which existed under the British Raj. It first met on December 9, 1946, in Delhi. On August 15, 1947, India became an independent nation, and the Constituent Assembly started functioning as India's Parliament. B. R. Ambedkar drafted the Constitution of India in conjunction with the requisite deliberations and debates in the Constituent Assembly. The Assembly approved the Constitution on November 26, 1949 (celebrated as Constitution Day), and it took effect on January 26, 1950 — a day now commemorated as Republic Day in India. Once the Constitution took effect, the Constituent Assembly became the Provisional Parliament of India
Title: Constituent Assembly of India
Content: Committees presented reports on issues. ; B.N. Rau prepared an initial draft based on the reports and his research into the constitutions of other nations. ; The drafting committee, chaired by B. R. Ambedkar, presented a detailed draft constitution which was published for public discussion. ; The draft constitution was discussed, and amendments proposed and enacted. ; The constitution was adopted, with a committee of experts led by the Congress Party (known as the Congress Assembly Party) played a pivotal role. Dr. Rajendra Prasad was elected as the president and Its vice-president was Harendra Coomar Mookerjee, a Christian from Bengal and former vice-chancellor of Calcutta University. Also chairing the assembly's Minorities Committee, Mookerjee was appointed governor of West Bengal after India became a republic. Jurist B. N. Rau was appointed constitutional adviser to the assembly; Rau prepared the original draft of the constitution, and was later appointed a judge in the Permanent Court of International Justice in The Hague. The assembly's work had five stages:
Title: Constituent Assembly of India
Content:  committee were: K.M.Munshi, Muhammed Saadulah, Alladi Krishnaswamy Iyer, Gopala Swami Ayyangar, N. Madhava Rao (He replaced B.L. Mitter who resigned due to ill-health), T. T. Krishnamachari (He replaced D.P. Khaitan who died in 1948). ; 16 July 1948: Along with Harendra Coomar Mookerjee, V. T. Krishnamachari was also elected as the second vice-president of the Constituent Assembly. ; 26 November 1949: 'Constitution of India' passed and adopted by the assembly. ; 24 January 1950: Last meeting of the Constituent Assembly. 'Constitution of India' (with 395 articles, 8 schedules, 22 parts) was signed and accepted by all. ; 26 January 1950: The 'Constitution of India' came in to force after 2 years, 11 months and 18 Days, at a total expenditure of ₹6.4 million to finish. ; Ganesh Vasudev Mavalankar was the first speaker when meeting the assembly of Lok Sabha, after turning republic. 
Title: Constitution of Pakistan of 1956
Content:  the Independence Act and was entrusted with two separate functions:  The powers and functions of the central legislature under the Government of India Act were conferred on the Constituent Assembly. The Constituent Assembly could, however, amend the Indian Independence Act (1947) or the Government of India Act (1935) and no Act of the British Parliament could be extended to Pakistan without legislation by the Constituent Assembly. The first Constituent Assembly originally consisted of 69 members; subsequently the number of members was increased to 79. The first major step in the framing of a constitution for Pakistan was taken by the Constituent Assembly on 12 March 1949, when it passed a 
Title: First Nehru ministry
Content:  of the Constituent Assembly who had not withdrawn to Karachi became India's Parliament. Only 28 members of the Muslim League finally joined the Indian Assembly. Later, 93 members were nominated from the princely states. The Congress thus secured a majority of 82%. Jawaharlal Nehru took charge as the first Prime Minister of India on 15 August 1947, and chose 15 other members for his cabinet. Vallabhbhai Patel served as the first Deputy Prime Minister until his death on 15 December 1950. Lord Mountbatten, and later C. Rajagopalachari, served as Governor-General until 26 January 1950, when Rajendra Prasad was elected as the first President of India.
Title: Parliament of Pakistan
Content:  Act 1935. The first session of the first Constituent Assembly of Pakistan was held on 10 August 1947 at Sindh Assembly Building in Karachi. On 11 August 1947 Muhammad Ali Jinnah was elected unanimously as the president of the Constituent Assembly of Pakistan and the National Flag was formally approved by the Assembly. On 12 August 1947, a resolution was approved regarding officially addressing Jinnah as Quaid-i-Azam. On the same day, a special committee called the "Committee on Fundamental Rights of Citizens and Minorities of Pakistan" was appointed to look into and advise the Assembly on matters relating to fundamental rights of 
Title: Constituent Assembly of India
Content:  At 11 am on 9 December 1946 the Assembly began its first session, with 211 members attending. By early 1947, representatives of the Muslim League and princely states joined, and the Assembly approved the draft constitution on 26 November 1949. On 26 January 1950 the constitution took effect (commemorated as Republic Day), and the Constituent Assembly became the Provisional Parliament of India (continuing until after the first elections under the new constitution in 1952).

Question: who was the first president of the constituent assembly?
Answer: Dr. Rajendra Prasad.