The Indian National Army (INA) came into existence in 1943 in Singapore.

The INA was formed during World War II with the aim of liberating India from British colonial rule. It was initially formed under the leadership of Indian nationalist Subhas Chandra Bose, who had sought support from the Axis powers, including Japan and Germany, in his fight against British rule. The INA`s headquarters were established in Singapore, which was then under Japanese occupation.

The INA recruited Indian prisoners of war and civilians from Southeast Asia, including Burma (now Myanmar), Malaya (now Malaysia), and other regions. It participated in military campaigns alongside Japanese forces in Southeast Asia, particularly in Burma and Northeast India.

So, the correct answer is: Singapore.