Which of the following are novels of Irvine welsh?
[A] The acid house
[B] Trainspotting
[C] Beside the ocean of time
[D] Filth
[E] Maris Belfrage
Choose the correct answer from the options given below:

The correct option is A, B and D only.

Here is a detailed breakdown of each of the works listed to understand why they are associated with Irvine Welsh or other authors:

[A] The Acid House: This is a 1994 collection of short stories (and one novella) by the Scottish writer Irvine Welsh. It was later adapted into a film of the same name in 1998, with the screenplay written by Welsh himself.
[B] Trainspotting: This is Irvine Welsh's debut novel, published in 1993. It is his most famous work, written in a mixture of Scottish English, Scots, and Edinburgh slang. It follows a group of heroin users in Edinburgh and was famously adapted into a landmark film directed by Danny Boyle in 1996.
[C] Beside the Ocean of Time: This novel was written by the Scottish poet and novelist George Mackay Brown. Published in 1994, it was shortlisted for the Booker Prize and is not written by Irvine Welsh.
[D] Filth: This is a 1998 novel by Irvine Welsh. It features a corrupt, misanthropic Edinburgh police officer as the protagonist and was also adapted into a feature film in 2013.
[E] Maris Belfrage: This is a work by the Scottish novelist and short story writer George Friel (published posthumously), not Irvine Welsh.

Therefore, among the choices provided, [A], [B], and [D] are works written by Irvine Welsh, making the correct option A, B and D only.