Explanation:

Recently,the Central government has told the Karnataka High Court that it will look into the matter of the ‘Havana Syndrome’ in India, in response to a Bengaluru resident’s recent petition.

• It refers to a set of mental health symptoms that are said to be experienced by United States intelligence and embassy officials in various countries.

• It is worth noting that in general, the word ‘syndrome’ simply means a set of symptoms.

• It does not mean a unique medical condition, but rather a set of symptoms that are usually experienced together whose origins may be difficult to confirm.

• Symptoms: Such as hearing certain sounds without any outside noise, nausea, vertigo and headaches, memory loss and balance issues.

Origin

• As the name suggests, it traces its roots to Cuba in late 2016.

• This was about a year after the US opened its embassy in the capital city of Havana after ties between the two countries were normalised in 2015.

• Some US intelligence officials and members of the staff at the embassy began experiencing sudden bursts of pressure in their brains followed by persistent headaches, feelings of disorientation and insomnia.

• In India, the first such case was reported in 2021, when a US intelligence officer travelling to New Delhi with CIA director William Burns reported symptoms of Havana Syndrome.

• No one isentirely sure about the causes of this syndrome.

Hence option 4th is correct.