BHaus, that's very much untrue.
Ploidy refers to the # of sets of chromosomes in a cell. Humans are diploid because we have 23 homologous pairs of chromosomes, two complete haploid sets (one set from the father and one set from the mother).
At metaphase each of the 46 chromosomes (members of the 23 pairs) consists of two sister chromatids that had formed after replication in S phase. So there is a total of 92 chromatids, but that does not mean there is 92 chromosomes. It's easy to follow chromosome number by keeping track of the number of centromeres. Sister chromatids become individual chromosomes during anaphase, when the centromeres split.
So you start with 23 pairs (46 chromosomes) in interphase/mitosis, and each member of the pair replicates itself. Technically speaking, you have double the amount of genetic material but still 46 chromosomes since the replicated material shares a centromere. The only time you really have "92 chromosomes" is the moment after anaphase. The sister chromatids that were previously held together by the centromere split, and each become their own chromosome -- 46 chromosomes are pulled to one side and 46 to the other side. After cytokinesis, there are two new cells with 46 chromosomes (23 pairs like at the beginning), and this ends the cycle. The cell is never 4n because there is never 4 homologs (or members of a homologous family).
Consider meiosis. The goal is to get 4 haploid cells from one diploid cell. With your 23 pairs (46 chomosomes) in your diploid cell, you replicate to 23 tetrads. A tetrad consists of 4 chromatids, two sets of sisters, and technically 46 chromosomes because the sisters are held together by centromeres.
Meiosis I happens, and the tetrads are pulled apart (but no centromeres are pulled apart). So a cell with 46 chromosomes becomes 2 cells, each with 23 chromosomes (reductive division). This cell is haploid because there is no longer a homologous pair in any cell. Each of the two new cells only consists of the sister chromatids that were a result of replication. Meosis II serves to split the sister chromatids apart. Remember, this splitting results in each chromatid becoming its own chromosome, so you go from 23 chromosomes in one cell to 23 chromosomes in each cell. This happens in each of the two cells that resulted from meiosis I, so you have 4 cells that contain 23 chromosomes = haploid.
Long winded I know, but this is a complicated topic. It's definitely a game of semantics, but the MCAT likes to prety on semantics when it comes to this topic.